fix: remove unrelated flaky test skips added during CI failures

These 5 local skips (browser.spec, coverage.spec, navigation.spec,
screenshot.spec, waittask.spec) were unrelated to the allowlist feature
and were masking real CI flakiness instead of fixing root causes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kblok

lib/PuppeteerSharp.Nunit/TestExpectations/TestExpectations.local.json

@@ -138,40 +138,5 @@
     "platforms": ["linux", "win32"],
     "parameters": ["chrome", "cdp"],
     "expectations": ["SKIP"]
-  },
-  {
-    "comment": "Flaky on headful Linux CI: Chrome fails to open a new tab after last page closes due to process state races",
-    "testIdPattern": "[browser.spec] Browser specs Browser.process should keep connected after the last page is closed",
-    "platforms": ["linux"],
-    "parameters": ["chrome", "headful"],
-    "expectations": ["SKIP"]
-  },
-  {
-    "comment": "Flaky on headful Linux CI: coverage data differs in headful mode",
-    "testIdPattern": "[coverage.spec] Coverage specs JSCoverage should report right ranges for \"per function\" scope",
-    "platforms": ["linux"],
-    "parameters": ["chrome", "headful"],
-    "expectations": ["SKIP"]
-  },
-  {
-    "comment": "Flaky on headful Linux CI: BFCache restore causes GoBack to return null response",
-    "testIdPattern": "[navigation.spec] navigation Page.goBack should work",
-    "platforms": ["linux"],
-    "parameters": ["chrome", "headful"],
-    "expectations": ["SKIP"]
-  },
-  {
-    "comment": "Flaky on headful Linux CI: clearDeviceMetricsOverride does not reset window.innerWidth to 0 in Xvfb",
-    "testIdPattern": "[screenshot.spec] Screenshots Page.screenshot should restore to original viewport size after taking fullPage screenshots when defaultViewport is null",
-    "platforms": ["linux"],
-    "parameters": ["chrome", "headful"],
-    "expectations": ["SKIP"]
-  },
-  {
-    "comment": "Flaky on Firefox headless BiDi Linux CI: waitForSelector bounding box assertion fails intermittently",
-    "testIdPattern": "[waittask.spec] waittask specs Frame.waitForSelector should wait for element to be visible (bounding box)",
-    "platforms": ["linux"],
-    "parameters": ["firefox", "webDriverBiDi"],
-    "expectations": ["SKIP"]
   }
 ]