feat: optimize run conditions for conditional unit tests

[erikburt]

Changes

• Add more optimized run-conditions for conditional tests workflow

Notes

• Core Tests will run if:

  • any 'core changes' or
  • any 'workflow changes' or
  • scheduled event or
  • push to develop

• CCIP Deployment tests will run if:

  • any 'deployment changes' or
  • any 'workflow changes' or
  • scheduled event or
  • push to develop

• Run all tests (ie. ignore hash comparison) if

  • any testdata changes
  • scheduled event

Motivation

Even though test runs are conditional based on the binary's hash, this will further optimize whether or not they need to be built at all. Some example changes that will benefit from this:

• Workflow changes to other workflows
• Documentation changes
• Deployment changes not triggering core
• Integration tests changes not triggering deployment or core changes

Testing

Opened a PR against this PR branch (#15584):

• Only changes to README.md: https://github.com/smartcontractkit/chainlink/actions/runs/12246641170/job/34162943565?pr=15584 (skipped steps)
• Changes to a file in core/: https://github.com/smartcontractkit/chainlink/actions/runs/12246655848/job/34162993734?pr=15584 (didn't skip steps)

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RE-3313