fix(no_implicit_declare_namespace_export): skip declare global blocks

[SAY-5]

Per denoland/deno#33268, the no-implicit-declare-namespace-export rule fires on a top-level declare global { ... } block and tells users to add export {} to suppress it. TypeScript explicitly rejects export {} inside declare global ("Exports and export assignments are not permitted in module augmentations"), so the suggested fix doesn't compile.

Bail out of the rule when the module declaration's global flag is set so the hint is no longer surfaced for these blocks. Add valid-case tests covering declare global { const ... } and declare global { interface Window ... }.

Closes denoland/deno#33268

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