workflows - unify x86_64 workflow

[rmaddikery]

• Unifies bazel caches across bazel workflows so that PRs can restore a warm cache without pollluting it.
• nightly runs can seed it
• caches can now be persistent

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //:license-check

Status: ⚠️ Needs Review

Click to expand output

[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.3.0) and connecting to it...
INFO: Invocation ID: 133a83f2-9537-4f07-b8b8-5a6de9168b67
Computing main repo mapping: 
Computing main repo mapping: 
Loading: 
Loading: 4 packages loaded
Loading: 4 packages loaded
    currently loading: 
WARNING: Target pattern parsing failed.
ERROR: Skipping '//:license-check': no such target '//:license-check': target 'license-check' not declared in package '' defined by /home/runner/work/logging/logging/BUILD
ERROR: no such target '//:license-check': target 'license-check' not declared in package '' defined by /home/runner/work/logging/logging/BUILD
INFO: Elapsed time: 5.821s
INFO: 0 processes.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target