chore(ci): don't allow `main` or release branches to be interruptible

[erikayasuda]

Only allow feature branch pipelines to be interruptible, since we want to see all changes to main and release branches to fully run through the CI.

Checklist

• [x] PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• [ ] Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions[bot]]

CODEOWNERS have been resolved as:

.gitlab/tests.yml                                                       @DataDog/python-guild @DataDog/apm-core-python

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-11-22 22:40:20

Comparing candidate commit 06eaa9af0e90b9c5dbf215c3861d4e4a6470610d in PR branch erikayasuda/cancel-pipelines-on-pr with baseline commit defea4e21302a5d452919363403f06995b3992f9 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 388 metrics, 2 unstable metrics.