Fix multiple comments on label change failure

[yadij]

Only add comments when the labels actually changed.
The GH tool still needs to be updated to restore proper
behaviour.

[rousskov]

AFAICT, this script incorrectly ignores other [gh] failures as well. I also sense a disconnect/mismatch between failing to remove a label and the subsequent PR creation attempts that ignore that and other failures. There are other inconsistencies/puzzles as well. Said that, the proposed fix is probably a step forward.

[rousskov]

The GH tool still needs to be updated to restore proper behaviour.

FWIW, I do not know what that comment in PR description means/implies.

[kinkie]

The GH tool still needs to be updated to restore proper behaviour.

FWIW, I do not know what that comment in PR description means/implies.

It's comments like squid-cache/squid#2314 (comment)

[rousskov]

The GH tool still needs to be updated to restore proper behaviour.

FWIW, I do not know what that comment in PR description means/implies.

It's comments like squid-cache/squid#2314 (comment)

AFAICT, you are giving an example of a GitHub comment that PR-affected code is producing. I understand what those GitHub comments are. I do not understand the specific PR description paragraph that I have quoted.