Add devfile validation to explicitly disallow usage of mountSources and sourceMapping until we support them.

MR: Disallow usage of mountSources and sourceMappin... (!199305 - merged) • Omar Nasser • 18.4

Description

Overview

Add devfile validation to explicitly disallow usage of mountSources and sourceMapping until we support them.

See this comment on Add support for container specific postStart ev... (#553096 - closed) • Daniyal Arshad, Ashvin Sharma • 18.5 for context.

Details

We don't seem to be handling at all the devfile standards for mountSources and sourceMapping.

• https://devfile.io/docs/2.3.0/devfile-schema#components-container-mount-sources
• https://devfile.io/docs/2.3.0/devfile-schema#components-container-source-mapping

We should explicitly disable them in the devfile validation until we can add support for them.

Acceptance criteria

• If mountSources or sourceMapping appears in a devfile, the validation should fail
• User-facing documentation should be updated accordingly

Implementation plan

• These changes will be added to ee/lib/remote_development/devfile_operations/restrictions_enforcer.rb
• Doc updates will be made in doc/user/workspace/_index.md