Unset SERVER_KEEP_SHIM_TASKS

now, sshd

- is started by dstack-runner, not the entrypoint shell script
- has its own sshd_config, does not use distro-provided one
- has its own host keys location, avoiding overwriting host keys
  already present in the image

Part-of: #3419

* TestDocker_SSHServer - sshd check added
* TestDocker_SSHServerConnect - removed, as getSSHShellCommands does not
  start sshd since #3421
  The test should have failed since that PR, but, as there was no
  proper assertion, the test just slept for 180 seconds instead,
  reporting a false-positive result

Part-of: #3419

#3428)

* Add keys by the runner, not the shell script
* Don't touch user's ~/.ssh/authorized_keys, use our own file
* Share that file between all users

Part-of: #3419

Part-of: #3436

No fleets notification dstackai/dstack-cloud#373

* Don't set slots on CPU nodes
* Move the file to /dstack/mpi and make it world-readable

Fixes: #3434
Fixes: #3436

* [Dev environments] Support windsurf IDE #3443

* [Dev environments] Support windsurf IDE #3443

Replaced `surf` with `windsurf`(which is the only one alaviable on Linux)

* Pass Executor to Server as an argument
* Move repo blob-related code from the API handler to
  a new Executor method
* Fix http.MaxBytesError handling

… CLI/UI (#3445)

* [Feature] Added `dstack inspect` CLI command

* [Feature] Add `Inspect` tab to the run and fleet pages

* PR review feedback.

Replaced `dstack inspect run|fleet|volume|gateway` with seprate commands `datack run|fleet|volume|gateway list --json`.

* PR review: `dstack run|fleet get --json`

Updated how UUID format errors are handled

* PR review: `dstack run|fleet get --json`

Better handling edge case (empty ID)