chore: Use short Apache license header - #26761

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## Which issue does this PR close?

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Follow-up to apache#26761.


## Rationale for this change

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From apache#26761:

> Use the shorter Apache License 2.0 header instead. It saves tokens and
screen space.

The original configuration covered only `.rs`, `.py`, `.ts`, and `.slt`.
Other file types still used the long header; for example, `.slt.part`
files were not included.

## What changes are included in this PR?

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Existing dev tool use hawkeye to check/generate license header:
https://github.com/fast/hawkeye

- commit 1: preparations, set up hawkeye config files
- commit 2: ran the following command, all source license headers are
auto-converted
```
hawkeye remove --config licenserc-legacy.toml &&
hawkeye format --config licenserc.toml &&
hawkeye check --config licenserc.toml
```
- commit 3: clean up

## What is the testing strategy for this PR?
Updated `licenserc.toml`, to ensure those previously missed file types
can continue getting verified by CI (and auto-fixed by existing dev
script)

ALso let Codex to double checked no unintended changes.
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## Are there any user-facing changes?

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…ression (apache#27145)

## Which issue does this PR close?

- Partly closes apache#27108.
- Reverts apache#25790.

## Rationale for this change

On TPC-H Q18, DataFusion 56 takes about 233 s and 22 GB of peak memory
on an M3 Max, compared with about 7 s and 4 GB on 55.1.0. On x86_64 the
process runs out of memory (apache#27108). @devanbenz traced the regression to
apache#25790: the new Decimal filter selectivity estimate changes the join
order of the plan.

As agreed in
apache#24461 (comment),
this PR reverts apache#25790 before the 56 release.

apache#27146 tracks the work to
re-land the change.

## What changes are included in this PR?

This reverts commit 6145a09. The only
conflict was `filter_statistics_decimal.slt`, which apache#25790 added and
apache#26761 later edited. This PR deletes it.

## What is the testing strategy for this PR?

The existing tests, which pass locally.

## Are there any user-facing changes?

Filters on Decimal columns use the selectivity estimate from 55.x again.

----
Disclaimer: I used AI to assist in the code generation, I have manually
reviewed the output and it matches my intention and understanding.