Skip flakey header overrides e2e test

Bug: 421131932, 42086046
Change-Id: I14d5d3d5f95ba8041a28afec5b44200ce2491ed8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6596841
Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Auto-Submit: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>

Author: jackfranklin

test/e2e/sources/header-overrides_test.ts

@@ -119,7 +119,8 @@ describe('The Overrides Panel', function() {
     assert.deepEqual(await getTextFromHeadersRow(row), ['aaa', 'bbb']);
   });
 
-  it('can override headers via network panel', async () => {
+  // Regularly failing on CI.
+  it.skip('[crbug.com/421131932] can override headers via network panel', async () => {
     const {frontend} = getBrowserAndPages();
     await frontend.emulateMediaFeatures([
       {name: 'prefers-reduced-motion', value: 'reduce'},