chore(os-login): rm unused config API path

[zhumin8]

Removing unused API path from config for os-login, so that it matches the generated code status.

v1beta of java-os-login was added to the generation_config.yaml as part of initial migration to hermetic build: 14b7346, but client library code for v1beta is not present in java-os-login/google-cloud-os-login dir. This is due to deep-copy-regex being too strict and does not copy /v1beta from staging dir to final output.

Expect generation workflow to run successfully with not change. (no sample code exists for os-login)

For #12736
For googleapis/librarian#5370

[gemini-code-assist]

Code Review

This pull request removes the v1beta proto path for the OS Login API from the generation_config.yaml file. There are no review comments to address, and I have no feedback to provide regarding this change.

[zhumin8]

hmm, this config change did not trigger hermetic build:

+ changed_libraries=
+ echo 'Changed libraries are: No changed library.'
Changed libraries are: No changed library.

Forcing it to run with temp change to script

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[zhumin8]

After forcing generate on this library, now hermetic build workflow correctly triggers generate and completes with no code change:

Changed libraries are: os-login.

full log: https://github.com/googleapis/google-cloud-java/actions/runs/24739089474/job/72373657169?pr=12858

Now proceed to revert temp change.