feat(wintertc): migrate queueMicrotask from boa_runtime

[KaustubhOG]

Part of the TC55 migration tracked in #4988, building on the skeleton crate from #5105.

Moves the microtask module (queueMicrotask) from boa_runtime into boa_wintertc. globalThis.queueMicrotask() is required by the TC55 Minimum Common Web API (section 5.2).

Changes:

• Moves mod.rs and tests.rs into boa_wintertc. Implementation is unchanged - only a TC55 status note added to the module docs.

• Adapts the test. Runtime's test proves microtask ordering by capturing console.log output, but console is not migrated into boa_wintertc yet, so the console-based pieces can't be used here:

  • Dropped use crate::RuntimeExtension; - RuntimeExtension is a boa_runtime trait; boa_wintertc registers via plain register() functions instead.
  • Dropped use crate::console::tests::RecordingLogger; - RecordingLogger lives in the console module, which is still a stub here.
  • Dropped the logger + ConsoleExtension(logger).register(...) setup - this installed a console to record console.log output; not available without a migrated console.
  • Replaced the logger.log assertion with the same ordering check done in JS: each step does order.push(n) into an array, and the array is asserted to equal [1,3,9,2,4,8,5,7,6].

  Net result: identical behaviour tested (synchronous pushes first, then microtasks in FIFO order including re-queued ones), but the test depends only on the shared harness - not on a console migration.

Line counts:

File	runtime (source)	wintertc before	wintertc after
microtask/mod.rs	33	23 (stub)	39
microtask/tests.rs	55	0	52

mod.rs: +6 vs source is the TC55 doc note; code identical. console-free (like the base64 tests).

Approach: boa_runtime keeps its module for now - no behaviour change, no new cross-crate dependency. Re-export is a follow-up.

Testing: cargo build / clippy / fmt clean. cargo test -p boa_wintertc passes once #5418 merges. cargo test -p boa_runtime microtask still passes (source untouched). Test262 N/A (Web API).

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	53,125	53,125	0
Passed	51,072	51,072	0
Ignored	1,482	1,482	0
Failed	571	571	0
Panics	0	0	0
Conformance	96.14%	96.14%	0.00%

Tested main commit: 8a1e8fe07f626f7a067afc2c9885d5d87de4bb5d
Tested PR commit: 8e9d3f94ac1cbcefe989115266026f5fd3e0a947
Compare commits: 8a1e8fe...8e9d3f9

[KaustubhOG]

Hey @jedel1043 . The tests use the shared harness and indoc from #5418, so cargo test won't compile until that merges ( Test/MSRV checks are red). Build is clean, and it passes locally when combined with #5418.

on tests.rs: I couldn't copy it as exact since the runtime test checks ordering via console.log, and console isn't migrated yet. So I dropped the console bits and just record order into a JS array, asserting the same [1,3,9,2,4,8,5,7,6]. no console dependency.
do you think this approach is correct

Will rebase and mark ready once #5418 lands