Temporarily skip sanity on main branch

[Michael Duggan (miduggan24)]

Issue Link:
NOJIRA

Description of Problem/Feature:
Sanity is currently failing on main branch until merge of release into main, but daily builds on main are needed for TE2

Description of Fix/Solution:
Enable daily builds on main, skip sanity tests for main branch, and enable regression checks on main branch runs

Testing Done:
CI

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Note

Medium Risk
Changes branch gating in CI/CD, which can alter what tests run and when downstream pipelines are triggered; main branch now bypasses sanity, increasing the chance of regressions slipping through until the temporary condition is reverted.

Overview
Enables the scheduled dev-apps GitHub Actions trigger to run for both main and release_2.8-1.5 instead of only the release branch.

Updates the Jenkins pipeline to also poll/trigger on main, skips the Execute CI Tests (sanity) stage on main, and allows main builds to trigger SQA regression pipelines (in addition to release branches).

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[Michael Duggan (miduggan24)]

• Need to determine if daily/weekly build on main