RFR: 2169 pr-bot should ignore case in "Backport <sha>" PR titles [v2]

[Guoxiong Li]

On Fri, 9 Feb 2024 19:24:06 GMT, Ludvig Janiuk <lujaniuk at openjdk.org> wrote:

>> There's no reason why this should validate case, and has caused unnecessary friction in the past.
>
> Ludvig Janiuk has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - noop
>  - noop

It is good to add some test cases to verify this changement.

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PR Comment: https://git.openjdk.org/skara/pull/1611#issuecomment-1937918137