Always use regex matcher when determining contacts for build failure notifications

[konrad-jamrozik]

Follow-up PR:

• Update NotificationConfiguration NuGet package version to 1.0.0-dev.20230216.1 to enable CODEOWNERS regex matcher everywhere #5488

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This PR is a follow-up to:

• Update NotificationConfiguration package to 20230214.1 to enable CODEOWNERS regex matcher to default to true #5452
• Use CodeownersFile.UseRegexMatcherDefault everywhere where applicable + remove obsolete tests #5437

That previous PR was aiming to enable the new regex-based matcher everywhere, but didn't. Now it will, once the NuGet feed is updated. This is because by not passing the useRegexMatcher argument, I am relying on the default of true, set by:

• Enable the new, regex-based, wildcard-supporting CODEOWNERS matcher #5088
• Use CodeownersFile.UseRegexMatcherDefault everywhere where applicable + remove obsolete tests #5437

Related work:

• Add support for wildcard handling of file matching in codeowners library #2770