add ignoreErrors and ignoreTransactions for Dart

[martinhaintz]

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Based on this PR from sentry-dart 2207 I added the ignoreErrors and ignoreTransactions option to the docs.

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[buenaflor]

looks good! pre-emptively approving this, we can merge this when the next release is out

[martinhaintz]

I improved the misleading code samples to make the difference between string comparison and regex more clear.

[buenaflor]

@vivianyentran could you rerun the vercel ci pls

[kahest]

@buenaflor I re-ran Vercel - you can ping me as well if you need Vercel deployments :)