Upgrade: Improve heuristics around important codemod

[philipp-spiess]

This PR improves the heuristics around the important codemod (e.g. !border => border!) as we noticed a few more cases where we the current heuristics was not enough.

Specifically, we made it not migrate the candidate in the following conditions:

• When there's an immediate property access: { "foo": !border.something + ""}
• When it's used as condition in the template language: <div v-if="something && !border"></div> or <div x-if="!border"></div>

Test plan

I added test cases to the unit tests and updated the integration test to contain a more sophisticated example.

[philipp-spiess]

• Upgrade: Improve heuristics around important codemod #14774 👈
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