Static Analysis - fill e2e test gaps

• Test gaps identified
• SAST analysers ruleset customisation by disablement https://docs.gitlab.com/ee/user/application_security/sast/customize_rulesets.html#disable-predefined-analyzer-rules
• SAST analysers ruleset customisation by overriding https://docs.gitlab.com/ee/user/application_security/sast/customize_rulesets.html#override-predefined-analyzer-rules
• SAST add test for code quality report being displayed https://docs.gitlab.com/ee/ci/testing/code_quality.html