[Bug]: Fix release publish workflow

[wangyb-A]

Expected Behavior

1. When we only bump version and release of a package (e.g. otel / main sdk / testing lib), we should only publish the changed package to pypi
2. We should only trigger emulator workflow when there's release in testing lib

Actual Behavior

1. We are triggering the pypi publish for all the packages (otel, main sdk, testing lib) link
2. We are triggering emulator workflow for every release link
3. The credential step for emulator release also needs to be fixed.

Steps to Reproduce

See link in the description

SDK Version

1.6.0

Python Version

3.14

Is this a regression?

No

Last Working Version

No response

Additional Context

No response