Poll history - remove active development labs flag

[kerryarchibald]

Polls history is feature complete and has been reviewed by design (internal ticket here)

This PR removes the labs flag used to hide poll history during active development.

Poll history is now accessible through the room info panel and the room settings:

Checklist

• Tests written for new code (and old code if feasible)
• Linter and other CI checks pass
• Sign-off given on the changes (see CONTRIBUTING.md)

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This change is marked as an internal change (Task), so will not be included in the changelog.

[florianduros]

LGFM

[t3chguy]

@kerryarchibald releasing features from labs needs explicit sign off from product, please acquire posthumously or it'll need reverting

[kittykat]

It should ideally have a review from QA as well ;)

[Johennes]

There is some context missing here. This is a former PS project and, as such, has been managed in Jira. Design review has been completed in https://element-io.atlassian.net/browse/PSG-1179 and cross-platform testing was covered in https://element-io.atlassian.net/browse/PSG-1054.

@jakewb-b would you mind giving us formal product approval for the delabsing in retrospect?

[jakewb-b]

Thanks. De-labsing this is approved from the product POV.

[t3chguy]

@jakewb-b can we have a checkmark please

[jakewb-b]

@t3chguy - as far as I can see, I don't have the ability to add a review anymore, presumably because this is already merged. Or am I missing something?

[t3chguy]

oh indeed. ah well thanks for trying