Log error content captured during build

What does this MR do?

• When the code build runs, the error content/stack trace printed on the standard error stream is now logged instead of just exit status message.
• When the user does not set SAST_JAVA_VERSION variable or sets unsupported Java version, added warning log on fallback version switch. Sample log message below:

[WARN] [Find Security Bugs] [2022-02-16T11:15:11Z] ▶ Java version not set in 'SAST_JAVA_VERSION' variable, using Java 8 as fallback.
Read more about setting Java Version at: https://docs.gitlab.com/ee/user/application_security/sast/#analyzer-settings

[WARN] [Find Security Bugs] [2022-02-16T11:23:29Z] ▶ Unsupported Java version set in 'SAST_JAVA_VERSION' variable, using Java 8 as fallback.
Read more about supported Java Versions at: https://docs.gitlab.com/ee/user/application_security/sast/#analyzer-settings

What are the relevant issue numbers?

gitlab-org/gitlab#322832 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template (also in CE)
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer