Update Gitlab chat error message

Madelein van Niekerkrequested to merge
gitlab-chat/reword-error-message into master

What does this MR do and why?

Updates Gitlab chat error message as per feedback.

from

There was an error communicating with GitLab Chat. Please reach out to GitLab support for more assistance or try again later.

to

There was an error communicating with GitLab Chat. Please try again later.

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