feat: Add awaitExecution option to injectScript utility

[mrdotb]

Overview

Add support for awaiting script execution in MV3 extensions. The new awaitExecution option returns a promise that resolves when the script loads successfully or rejects on error.
It does not change the current behavior of injectScript

Manual Testing

I tested the function manually I searched to see if there is unit test or e2e test but could not find test covering injectScript.

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commit: 79623f2

[aklinker1]

Gonna close this in favor of #1763

[aklinker1]

Feel free to re-open and add back the option if you need it.