feat: allow alternative recorder script names

[pauldambra]

we want to allow specifying the name of the recorder script so we can roll out changes without affecting everyone all at once

this lets us use environment variables to specify an alternative name and a set of teams that should receive it

i've confirmed locally this works when paired with PostHog/posthog-js#1509

[pauldambra]

slightly over careful in returing a structure rather than a value in case this changes over time e.g. loading from a different host

[pauldambra]

towards #25721

[posthog-bot]

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[posthog-bot]

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[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week. If you want to permanentely keep it open, use the waiting label.

[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

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Filename	Size
frontend/dist/toolbar.js	1.16 MB

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[posthog-bot]

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[posthog-bot]

📸 UI snapshots have been updated

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[ioannisj]

I don't understand much, but I see some test there :)