Remove accidentally commited release notes

Remove accidentally commited release notes.

/cc @fwinkl @tsulaia

This merge request affects no known packages. Consult an expert!

This merge request affects 1 file:

• release_notes.md

Could not map the following files to a domain:

• release_notes.md

added main no-domain review-pending-level-1 labels

My bad. Sorry about that!

CI Result SUCCESS (hash 0e941023)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output (remote access info)

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 06ce98e9