fix: GSSA inputs and version update (#467) (#472)

### Description

fix: update GSSA default image version
fix: add pass/fail for GSSA job
fix: scheduled workflows only on latest Splunk
feat: add inputs for GSSA and GS standard versions

### Checklist

- [x] `README.md` has been updated or is not required
- [ ] push trigger tests
- [ ] manual release test
- [ ] automated releases test
- [ ] pull request trigger tests
- [ ] schedule trigger tests
- [ ] workflow errors/warnings reviewed and addressed

### Testing done 
splunk/splunk-add-on-for-microsoft-windows#575


splunk/splunk-add-on-for-google-cloud-platform#917
splunk/splunk-add-on-for-okta-identity-cloud#412

---------

### Description

(PR description goes here)

### Checklist

- [ ] `README.md` has been updated or is not required
- [ ] push trigger tests
- [ ] manual release test
- [ ] automated releases test
- [ ] pull request trigger tests
- [ ] schedule trigger tests
- [ ] workflow errors/warnings reviewed and addressed

### Testing done 
(for each selected checkbox, the corresponding test results link should
be listed here)

Author: mkolasinski-splunk