Bunch of streams fixes

[Jarred-Sumner]

What does this PR do?

• Faster microticks by not updating the daylight savings time cache on every microtask call
• Automatically flush pending writes to HTTP response bodies after the microtask queue has been drained, which fixes ReadbleStream reads to completion in server, does not stream #1886
• Fix a UAF in fetch body streams

How did you verify your code works?

There are tests

[github-actions]

✅ test failures on linux-x64-baseline have been resolved.

^{#daf7e4d5049c5caf47dcc40be40ded76ff305502}

[github-actions]

❌ @cirospaciari 1 files with test failures on linux-x64:

• test/bundler/esbuild/splitting.test.ts

View test output

^{#daf7e4d5049c5caf47dcc40be40ded76ff305502}

[github-actions]

❌ @cirospaciari 4 files with test failures on bun-darwin-aarch64:

• test/js/bun/test/test-test.test.ts
• test/js/node/fs/fs.test.ts
• test/js/node/watch/fs.watch.test.ts
• test/js/third_party/resvg/bbox.test.js

View test output

^{#daf7e4d5049c5caf47dcc40be40ded76ff305502}

[github-actions]

❌ @cirospaciari 8 files with test failures on bun-darwin-x64-baseline:

• test/bundler/bundler_compile.test.ts
• test/js/bun/spawn/spawn-streaming-stdin.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/node/fs/fs.test.ts
• test/js/third_party/resvg/bbox.test.js
• test/js/third_party/webpack/webpack.test.ts
• test/js/web/timers/setInterval.test.js
• test/js/web/timers/setTimeout.test.js

View test output

^{#daf7e4d5049c5caf47dcc40be40ded76ff305502}