Add test reporter to prevent stale screenshots (#12743)

* Split up slow Playwright tests

To optimise parallelism

Deals with:

```
Slow test file: read-receipts/redactions.spec.ts (5.4m)
Slow test file: read-receipts/new-messages.spec.ts (3.9m)
Slow test file: read-receipts/high-level.spec.ts (3.6m)
Slow test file: read-receipts/editing-messages.spec.ts (3.1m)
Slow test file: read-receipts/reactions.spec.ts (2.2m)
Slow test file: crypto/crypto.spec.ts (2.4m)
Slow test file: settings/appearance-user-settings-tab/appearance-user-settings-tab.spec.ts (1.2m)
Slow test file: composer/composer.spec.ts (1.1m)
Slow test file: crypto/verification.spec.ts (1.1m)
```

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

* Move around snapshots

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

* Add test reporter to prevent stale screenshots

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

* Iterate

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

* Fix test

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

* Iterate

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

* Remove darwin screenshots which should not have been checked in

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

* Fix absolute vs relative path mismatch

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

* Revert "Remove darwin screenshots which should not have been checked in"

This reverts commit 1e189977fa9ec873339fc02b2b231a314809b2d5.

* Iterate

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

* Revert "Revert "Remove darwin screenshots which should not have been checked in""

This reverts commit 5144b9b28e31ca543b2c5d02820c3f957dbd8c04.

* Iterate

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

* Remove stale screenshots

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

* Revert "Remove stale screenshots"

This reverts commit 9beae9974557c1ffa99c2372da280bb0da407bd1.

* Apply same sanitization as Playwright for file name consistency

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

* add dev dep

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

* Remove stale screenshots

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

* Discard changes to playwright/flaky-reporter.ts

* Update end-to-end-tests.yaml

---------

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

package.json

@@ -213,6 +213,7 @@
         "fake-indexeddb": "^6.0.0",
         "fetch-mock-jest": "^1.5.1",
         "fs-extra": "^11.0.0",
+        "glob": "^11.0.0",
         "jest": "^29.6.2",
         "jest-canvas-mock": "^2.5.2",
         "jest-environment-jsdom": "^29.6.2",
@@ -223,6 +224,7 @@
         "matrix-web-i18n": "^3.2.1",
         "mocha-junit-reporter": "^2.2.0",
         "node-fetch": "2",
+        "playwright-core": "^1.45.1",
         "postcss-scss": "^4.0.4",
         "prettier": "3.3.2",
         "raw-loader": "^4.0.2",