Do not disable BackgroundCompilation in benchmarks

[Akirathan]

Fixes #9563 and #9470

Pull Request Description

Setting --engine.BackgroundCompilation=false causes huge regressions in the Engine benchmarks. This PR ensures that all the contexts in the benchmarks are created with BackgroundCompilation=true.

#9470 is "fixed" by increasing warmup for Table sorting stdlib benchmarks. We will monitor these to check if that was sufficient.

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[JaroslavTulach]

Great, if the benchmarks get more stable.