Maintenance: Update help text of branch rules

Issue: #552080 (closed)

What does this MR do and why?

Update the help text in the branch rule creation modal to < msgid "BranchRules| %{linkStart}Wildcards%{linkEnd} such as *-stable or production/* are supported. %{linkStart}Branch names are case-sensitive%{linkEnd}." from > msgid "BranchRules|%{linkStart}Wildcards%{linkEnd} such as *-stable or production/ are supported"

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