Allow to mark codeowners section as optional

Igor Drozdovrequested to merge
id-required-code-owners-file into master

What does this MR do?

Related issue: #232995 (closed)

A section can be prefixed with ^ symbol:

[Documentation]
ee/docs    @gl-docs
docs       @gl-docs

^[Database]
README.md  @gl-database
model/db   @gl-database

That means that Database section is optional even when code-owners-approvals is required

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