Update old test case link with max comments

What does this MR do?

Update old test case urls that have hit max number of comments

• gitlab-org/quality/testcases#708 (closed) to gitlab-org/quality/testcases#1766 (closed)
• gitlab-org/quality/testcases#1273 (closed) to gitlab-org/quality/testcases#1768 (closed)
• gitlab-org/quality/testcases#609 (closed) to gitlab-org/quality/testcases#1770 (closed)
• gitlab-org/quality/testcases#607 (closed) to gitlab-org/quality/testcases#1769 (closed)
• gitlab-org/quality/testcases#1272 (closed) to gitlab-org/quality/testcases#1767 (closed)

Will archive old issues once this is merged