Split summary comment if exceeded max characters

[attiasas]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.

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On BitBucket, they limit the maximum number of characters per comment.
In case we have a PR that has a lot of issues, this results in an error when trying to create the comment:
11:07:00 [Error] couldn't add pull request comment: Status: 400 Bad Request, Body: {"errors":[{"context":"text","message":"Please enter a non-empty value less than 32768 characters","exceptionName":null}]}

For Azure, the limit for description size is 4000 chars, if exceeded it creates the following error:

Changes:

• Mark Summary and Review comments the same (stop detecting by banner anymore).
• If the maximum number of characters is exceeded for the summary comment, split it into multiple comments

[eranturgeman]

1. did you verify that the new added line + split comment length doesn't pass the max possible chars in a comment?

2. what happens if the split it exactly in one of the titles? the first part of the title will get the ## or ### and will be presented in a big and bold font, but the second part of the title will not. will it present it as we want?

[github-actions]

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