feat: roll Firefox to 150.0, sync test expectations with upstream PR #14900

- The Firefox DefaultBuildId was already updated to stable_150.0 in a prior commit
- Sync TestExpectations.upstream.json with upstream puppeteer PR #14900:
  - Rename console test from "timing functions" to "group functions" with updated comment
  - Remove emulateNetworkConditions offline FAIL expectation for Firefox (now supported)
  - Remove Page.setOfflineMode FAIL expectations for Firefox BiDi (now supported)
  - Add fixtures stderr SKIP expectation for Firefox/webDriverBiDi on win32

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

Author: kblok

lib/PuppeteerSharp.Nunit/TestExpectations/TestExpectations.upstream.json

@@ -885,7 +885,7 @@
     "comment": "TODO: add a comment explaining why this expectation is required (include links to issues)"
   },
   {
-    "testIdPattern": "[console.spec] console should work for different console API calls with timing functions",
+    "testIdPattern": "[console.spec] console should work for different console API calls with group functions",
     "platforms": [
       "darwin",
       "linux",
@@ -898,7 +898,7 @@
     "expectations": [
       "FAIL"
     ],
-    "comment": "https://bugzilla.mozilla.org/show_bug.cgi?id=1866749"
+    "comment": "Failing since 150.0 due to https://bugzilla.mozilla.org/show_bug.cgi?id=1866749, reported as https://github.com/w3c/webdriver-bidi/issues/1097"
   },
   {
     "testIdPattern": "[CDPSession.spec] Target.createCDPSession *",
@@ -1082,21 +1082,6 @@
     ],
     "comment": "shell always emulates a focused page"
   },
-  {
-    "testIdPattern": "[emulation.spec] Emulation Page.emulateNetworkConditions should support offline",
-    "platforms": [
-      "darwin",
-      "linux",
-      "win32"
-    ],
-    "parameters": [
-      "firefox"
-    ],
-    "expectations": [
-      "FAIL"
-    ],
-    "comment": "Not supported by WebDriver BiDi"
-  },
   {
     "testIdPattern": "[evaluation.spec] Evaluation specs Page.evaluate should replace symbols with undefined",
     "platforms": [
@@ -2701,6 +2686,20 @@
     ],
     "comment": "We can't connect to a browser started with pipe:true"
   },
+  {
+    "testIdPattern": "[fixtures.spec] Fixtures should dump browser process stderr",
+    "platforms": [
+      "win32"
+    ],
+    "parameters": [
+      "firefox",
+      "webDriverBiDi"
+    ],
+    "expectations": [
+      "SKIP"
+    ],
+    "comment": "See https://github.com/puppeteer/puppeteer/issues/14774"
+  },
   {
     "testIdPattern": "[frame.spec] Frame specs Frame Management should support framesets",
     "platforms": [
@@ -3499,38 +3498,6 @@
     ],
     "comment": "Unknown command emulation.setScriptingEnabled"
   },
-  {
-    "testIdPattern": "[page.spec] Page Page.setOfflineMode should emulate navigator.onLine",
-    "platforms": [
-      "darwin",
-      "linux",
-      "win32"
-    ],
-    "parameters": [
-      "firefox",
-      "webDriverBiDi"
-    ],
-    "expectations": [
-      "FAIL"
-    ],
-    "comment": "Not supported by WebDriver BiDi"
-  },
-  {
-    "testIdPattern": "[page.spec] Page Page.setOfflineMode should work",
-    "platforms": [
-      "darwin",
-      "linux",
-      "win32"
-    ],
-    "parameters": [
-      "firefox",
-      "webDriverBiDi"
-    ],
-    "expectations": [
-      "FAIL"
-    ],
-    "comment": "Not supported by WebDriver BiDi"
-  },
   {
     "testIdPattern": "[page.spec] Page Page.setUserAgent should work with additional userAgentMetdata",
     "platforms": [