[8.14](backport #39087) Migrate packetbeat to static Buildkite pipeline

[dliappis]

Proposed commit message

This commit refactors the packetbeat pipeline to the pipeline selector
approach as laid out in #38783.

Related issues

• https:/elastic/ingest-dev/issues/3072

Logs

• all labels (aws, macos, arm, :Windows): ✅
  entire job: https://buildkite.com/elastic/beats/builds/6193
  packetbeat: https://buildkite.com/elastic/beats-packetbeat/builds/4069
  note: the x-pack/filebeat and x-pack/metricbeat failures are unrelated to this PR are are known failures in 8.14 tracked in https:/elastic/ingest-dev/issues/3208

Cherry-picked from 8f8f313

[elasticmachine]

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• Duration: 13 min 0 sec

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[dliappis]

@pkoutsovasilis as discussed offline, there is some flakiness with the Python test tests/system/test_file_integrity.py for auditbeat, see e.g. https://buildkite.com/elastic/auditbeat/builds/4174#018f058e-280e-4752-bef4-43edf8886b95/160-343 .
It's been spotted in this PR, but also other PRs. Note that this PR is against 8.14 but we've noticed it also in other branches.