[RTC-456] Add peerless room purge

[sgfn]

Acknowledging the stipulations set forth:

• [x] I hereby confirm that a Pull Request involving updates to the Software Development Kit (SDK) has been smoothly merged, currently awaits processing, or is otherwise deemed unnecessary in this context.
• [x] I also affirm that another Pull Request, specifically addressing updates to the documentation body (commonly referred to as 'docs'), has either been successfully incorporated, is in the process of review, or is considered superfluous under the prevailing circumstances.

[codecov[bot]]

Codecov Report

Merging #150 (fcc81f0) into main (6b61fc4) will decrease coverage by 0.04%. The diff coverage is 92.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #150 +/- ## ========================================== - Coverage 86.87% 86.84% -0.04% ========================================== Files 64 64 Lines 1227 1247 +20 ========================================== + Hits 1066 1083 +17 - Misses 161 164 +3 ``` | [Files](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev) | Coverage Δ | | |---|---|---| | [lib/jellyfish/component/file.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9jb21wb25lbnQvZmlsZS5leA==) | `100.00% <100.00%> (ø)` | | | [lib/jellyfish/room/config.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9yb29tL2NvbmZpZy5leA==) | `96.15% <100.00%> (+0.69%)` | :arrow_up: | | [lib/jellyfish\_web/api\_spec/room.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaF93ZWIvYXBpX3NwZWMvcm9vbS5leA==) | `100.00% <ø> (ø)` | | | [lib/jellyfish\_web/controllers/room\_controller.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaF93ZWIvY29udHJvbGxlcnMvcm9vbV9jb250cm9sbGVyLmV4) | `100.00% <100.00%> (ø)` | | | [test/support/webhook\_plug.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-dGVzdC9zdXBwb3J0L3dlYmhvb2tfcGx1Zy5leA==) | `100.00% <100.00%> (ø)` | | | [lib/jellyfish/room.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9yb29tLmV4) | `80.67% <86.66%> (-0.22%)` | :arrow_down: | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). Last update [6b61fc4...fcc81f0](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/150?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev).

[sgfn]

Bumped Elixir to 1.15 because we use Map.intersect which was added in that version

EDIT: disregard, restored 1.14 because test_load_balancing uses 1.14. Removed calls to Map.intersect instead