Cleanup remaining statekey usage for senderIDs

[codecov[bot]]

Codecov Report

Patch coverage: 42.85% and project coverage change: -0.08 :warning:

Comparison is base (ea5ef16) 57.07% compared to head (3617f5e) 56.99%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #393 +/- ## ========================================== - Coverage 57.07% 56.99% -0.08% ========================================== Files 49 49 Lines 6514 6530 +16 ========================================== + Hits 3718 3722 +4 - Misses 2451 2463 +12 Partials 345 345 ``` | [Impacted Files](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | Coverage Δ | | |---|---|---| | [join.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-am9pbi5nbw==) | `50.00% <ø> (ø)` | | | [eventV2.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-ZXZlbnRWMi5nbw==) | `36.11% <33.33%> (+0.51%)` | :arrow_up: | | [eventcrypto.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-ZXZlbnRjcnlwdG8uZ28=) | `53.21% <40.00%> (-0.32%)` | :arrow_down: | | [eventauth.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-ZXZlbnRhdXRoLmdv) | `55.21% <40.62%> (-0.53%)` | :arrow_down: | | [handlejoin.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-aGFuZGxlam9pbi5nbw==) | `75.69% <50.00%> (ø)` | | | [performjoin.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-cGVyZm9ybWpvaW4uZ28=) | `63.63% <66.66%> (ø)` | | | [eventversion.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/393?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-ZXZlbnR2ZXJzaW9uLmdv) | `78.02% <100.00%> (ø)` | |

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