RFR: 1345: sync-bot removing hgupdate-sync label from 8u5 backport

[Kevin Rushforth]

On Wed, 9 Feb 2022 17:38:30 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This patch fixes an issue in the synclabel bot. For update releases of 8 and 7, we have special ranges of build numbers that are used for special releases. These need to be, and are, handled separately in the synclabel bot. These ranges only apply to update releases however, and not the main feature releases, where the actual build numbers used went well into these ranges. 
> 
> Added a test that mimics the example mislabeled set of bugs.

Marked as reviewed by kcr (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1284