Analyzer consolidation in SAST CI template

What does this MR do and why?

• Following changes are made only in the stable SAST CI template (SAST.gitlab-ci.yml):
  • Replaces eslint, bandit and gosec analyzers in favor of semgrep analyzer
  • Defaults .go,.py,.java,.html and .js file support to semgrep analyzer
  • Removes support for Java-based projects from spotbugs analyzer in favor of semgrep analyzer
• Updated spec file(sast_gitlab_ci_yaml_spec.rb) to pass the tests supporting above changes.

Relevant issue numbers

• SAST Deprecation: Analyzer consolidation and CI... (#352554 - closed)
• Stop running spotbugs for java files (#355952 - closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.