Add StackProf to the Gemfile, along with a utility to get a profile for a spec

What does this MR do?

Adds stackprof to the development / test environment, along with a script to do an rspec run under stackprof

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The test suite needs speeding up significantly. This is one tool for investigating it.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Related to #23034 (closed)

Reassigned to @rspeicher

Mentioned in issue #23034 (closed)

Thanks @nick.thomas!

Added ~889916 label

Milestone changed to %8.15

@nick.thomas Docs? Maybe doc/development/performance.md or doc/development/testing.md.

Added 1613 commits:

• f033a1dd...e6d31ce3 - 1612 commits from branch gitlab-org:master
• f189ddc7 - Add StackProf to the Gemfile, along with a utility to get a profile for a spec

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Added 1 commit:

• 7e9260cb - Add StackProf to the Gemfile, along with a utility to get a profile for a spec

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@rspeicher Added some!

/cc @yorickpeterse for tone and content.

Added 1 commit:

• 5e05f9c5 - Add StackProf to the Gemfile, along with a utility to get a profile for a spec

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Added 1 commit:

• 5e05f9c5 - Add StackProf to the Gemfile, along with a utility to get a profile for a spec

Compare with previous version

Marked the task Documentation created/updated as completed

@nick.thomas

@nick.thomas Great docs, thanks!

Enabled an automatic merge when the build for 5e05f9c5 succeeds

Status changed to merged

Mentioned in commit 4ecb9594

mentioned in issue #24899 (moved)

mentioned in issue gitlab#7175