Update react monorepo to v19 (major) (#28914)

* Update react monorepo to v19

* Import JSX explicitly for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update react imports

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid legacy contexts as much as possible

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid deprecated React symbols

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* Stash

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* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Switch pillify to use a html-react-parser approach rather than DOM muddling

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate react html parsing

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* Iterate react html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate html parsing

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* Memoize the EventContentBody component

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

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* Iterate

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* Simplify

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* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Discard changes to src/Linkify.tsx

* Discard changes to src/components/views/messages/TextualBody.tsx

* Discard changes to src/settings/handlers/AbstractLocalStorageSettingsHandler.ts

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

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* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Prepare for React 19 upgrade

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

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* Remove stale comment

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---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

test/unit-tests/__snapshots__/TextForEvent-test.ts.snap

@@ -7,8 +7,6 @@ exports[`TextForEvent textForJoinRulesEvent() returns correct JSX message when r
     <AccessibleButton
       kind="link_inline"
       onClick={[Function]}
-      role="button"
-      tabIndex={0}
     >
       View settings
     </AccessibleButton>