Remove `tryRecord()` from the compilation pipeline now that all passes record
errors directly via `env.recordError()` / `env.recordErrors()`. A single
catch-all try/catch in Program.ts provides the safety net for any pass that
incorrectly throws instead of recording.
Key changes:
- Remove all ~64 `env.tryRecord()` wrappers in Pipeline.ts
- Delete `tryRecord()` method from Environment.ts
- Add `CompileUnexpectedThrow` logger event so thrown errors are detectable
- Log `CompileUnexpectedThrow` in Program.ts catch-all for non-invariant throws
- Fail snap tests on `CompileUnexpectedThrow` to surface pass bugs in dev
- Convert throwTodo/throwDiagnostic calls in HIRBuilder (fbt, this),
CodegenReactiveFunction (for-in/for-of), and BuildReactiveFunction to
record errors or use invariants as appropriate
- Remove try/catch from BuildHIR's lower() since inner throws are now recorded
- CollectOptionalChainDependencies: return null instead of throwing on
unsupported optional chain patterns (graceful optimization skip)
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