Proposal: Permanently disable rule SA1109

[sharwell]

All violations of rule SA1109 (BlockStatementsMustNotContainEmbeddedRegions) are also violations of rule SA1123 (DoNotPlaceRegionsWithinElements). I propose disabling SA1109 the same way we disabled SA1126 (in #997) for the following reasons:

1. Rule SA1109 is a subset of another rule; disabling the rule still leaves users with a warning and a code fix for less computational work.
2. Violations of SA1109 are rare; special-casing this rule is unlikely to ever provide significant benefits to users.

[Noryoko]

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[pdelvo]

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[JohanLarsson]

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