API methods use overall connection project instead of object's project

#### Environment details

  - OS: macOS 12.4
  - Node.js version: Node 16.15
  - npm version: 8.5.5
  - `@google-cloud/bigquery` version: 6.0.0

#### Steps to reproduce

```javascript
import { BigQuery, Dataset, Routine, Table } from '@google-cloud/bigquery';
import fs from 'fs';
import path from 'path';

const credentials = JSON.parse(fs.readFileSync(path.join(__dirname, 'credentials.json'), { encoding: 'utf-8' }));

const conn = new BigQuery({
  credentials,
  projectId: 'foo'
});

(async () => {
  const [datasets] = await conn.getDatasets({ projectId: 'bigquery-public-data' });
  const dataset = datasets[0];
  console.log(dataset);
  const [tables] = await dataset.getTables();
  console.log(tables[0]);
})()
  .then(() => {
    process.exit();
  })
  .catch((err) => {
    console.error(err);
  });
```

This will throw an error when I run `getTables` with message `ApiError: Not found: Dataset foo:austin_311`. To get this to work, I need to pass `projectId` to every method call, be it for fetching tables, routines, metadata, etc. This was surprising to me and coworkers where we had assumed that the methods would use the object's `projectId` versus the overall client. The console log on the dataset gives me:
```
Dataset {
  _events: [Object: null prototype] {},
  _eventsCount: 0,
  _maxListeners: undefined,
  metadata: {
    kind: 'bigquery#dataset',
    id: 'bigquery-public-data:austin_311',
    datasetReference: { datasetId: 'austin_311', projectId: 'bigquery-public-data' },
    location: 'US'
  },
  baseUrl: '/datasets',
  parent: BigQuery {
    baseUrl: 'https://bigquery.googleapis.com/bigquery/v2',
    apiEndpoint: 'https://bigquery.googleapis.com',
    timeout: undefined,
    globalInterceptors: [],
    interceptors: [ [Object] ],
    packageJson: {
      name: '@google-cloud/bigquery',
      description: 'Google BigQuery Client Library for Node.js',
      version: '6.0.0',
      license: 'Apache-2.0',
      author: 'Google LLC',
      engines: [Object],
      repository: 'googleapis/nodejs-bigquery',
      main: './build/src/index.js',
      types: './build/src/index.d.ts',
      files: [Array],
      keywords: [Array],
      scripts: [Object],
      dependencies: [Object],
      devDependencies: [Object]
    },
    projectId: 'foo',
    projectIdRequired: true,
    providedUserAgent: undefined,
    makeAuthenticatedRequest: [Function: makeAuthenticatedRequest] {
      getCredentials: [Function: bound getCredentials],
      authClient: [GoogleAuth]
    },
    authClient: GoogleAuth {
      checkIsGCE: undefined,
      jsonContent: [Object],
      cachedCredential: [JWT],
      _cachedProjectId: 'sql-app-146706',
      keyFilename: undefined,
      scopes: [Array],
      clientOptions: undefined
    },
    getCredentials: [Function: bound getCredentials],
    location: undefined,
    createQueryStream: [Function (anonymous)],
    getDatasetsStream: [Function (anonymous)],
    getJobsStream: [Function (anonymous)]
  },
  id: 'austin_311',
  createMethod: [Function: createMethod],
  methods: {
    create: true,
    exists: true,
    get: true,
    getMetadata: true,
    setMetadata: true
  },
  interceptors: [ { request: [Function: request] } ],
  pollIntervalMs: undefined,
  projectId: undefined,
  location: 'US',
  bigQuery: BigQuery {
    baseUrl: 'https://bigquery.googleapis.com/bigquery/v2',
    apiEndpoint: 'https://bigquery.googleapis.com',
    timeout: undefined,
    globalInterceptors: [],
    interceptors: [ [Object] ],
    packageJson: {
      name: '@google-cloud/bigquery',
      description: 'Google BigQuery Client Library for Node.js',
      version: '6.0.0',
      license: 'Apache-2.0',
      author: 'Google LLC',
      engines: [Object],
      repository: 'googleapis/nodejs-bigquery',
      main: './build/src/index.js',
      types: './build/src/index.d.ts',
      files: [Array],
      keywords: [Array],
      scripts: [Object],
      dependencies: [Object],
      devDependencies: [Object]
    },
    projectId: 'foo',
    projectIdRequired: true,
    providedUserAgent: undefined,
    makeAuthenticatedRequest: [Function: makeAuthenticatedRequest] {
      getCredentials: [Function: bound getCredentials],
      authClient: [GoogleAuth]
    },
    authClient: GoogleAuth {
      checkIsGCE: undefined,
      jsonContent: [Object],
      cachedCredential: [JWT],
      _cachedProjectId: 'foo',
      keyFilename: undefined,
      scopes: [Array],
      clientOptions: undefined
    },
    getCredentials: [Function: bound getCredentials],
    location: undefined,
    createQueryStream: [Function (anonymous)],
    getDatasetsStream: [Function (anonymous)],
    getJobsStream: [Function (anonymous)]
  },
  getModelsStream: [Function (anonymous)],
  getRoutinesStream: [Function (anonymous)],
  getTablesStream: [Function (anonymous)],
  [Symbol(kCapture)]: false
}
```

So the correct projectId is recorded as part of `dataset.metadata.id` and in `dataset.metadata.datasetReference.projectId`, but I'm guessing that that for the API calls, it uses `dataset.bigQuery.projectId` or something which is different.

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API methods use overall connection project instead of object's project #1133

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API methods use overall connection project instead of object's project #1133

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