Capitalize the first word of all auto-comments

Description

Capitalize the first word of all auto-comments. Currently, there is at least one scenario where this is not the case, which is not the existing convention. Refer to screenshot. Those circled entries should be:

Mentioned in issue #12345 

Added frontend in GitLab FOSS label

Added ~876590 label

Mentioned in issue gitlab-foss#24394 (closed)

Closing this since gitlab-foss#19797 (closed) already addresses auto generated comments more holistically.

Status changed to closed

reopened

mentioned in issue gitlab-foss#35481 (closed)

changed milestone to %10.0 in gitlab-foss

moved from gitlab-foss#24395 (moved)