chore: clean up some spec things (#28731)

Co-authored-by: Samuel Attard <[email protected]>

.gitignore

@@ -68,4 +68,6 @@ ts-gen
 .depshash-target
 
 # Used to accelerate builds after sync
-patches/mtime-cache.json
+patches/mtime-cache.json
+
+spec/fixtures/logo.png

spec-main/chromium-spec.ts

@@ -1447,7 +1447,13 @@ describe('font fallback', () => {
     const fonts = await getRenderedFonts(html);
     expect(fonts).to.be.an('array');
     expect(fonts).to.have.length(1);
-    if (process.platform === 'win32') { expect(fonts[0].familyName).to.equal('Arial'); } else if (process.platform === 'darwin') { expect(fonts[0].familyName).to.equal('Helvetica'); } else if (process.platform === 'linux') { expect(fonts[0].familyName).to.equal('DejaVu Sans'); } // I think this depends on the distro? We don't specify a default.
+    if (process.platform === 'win32') {
+      expect(fonts[0].familyName).to.equal('Arial');
+    } else if (process.platform === 'darwin') {
+      expect(fonts[0].familyName).to.equal('Helvetica');
+    } else if (process.platform === 'linux') {
+      expect(fonts[0].familyName).to.equal('DejaVu Sans');
+    } // I think this depends on the distro? We don't specify a default.
   });
 
   ifit(process.platform !== 'linux')('should fall back to Japanese font for sans-serif Japanese script', async function () {