Document that node:crypto.randomUUIDv7 is unsupported on Workers

[rufushsu9987]

Summary

• The Workers node:crypto docs claimed all APIs are supported aside from a short exceptions list, which implied randomUUIDv7() works under nodejs_compat.
• It does not: importing randomUUIDv7 from node:crypto fails at runtime (does not provide an export named 'randomUUIDv7'). workerd still lists it as unimplemented (cloudflare/workerd#6924).
• Add randomUUIDv7 to the documented exceptions on the Node.js crypto Workers page, matching the nearby “not supported” style and linking the Node.js API for clarity.

Fixes #32892

Test plan

• Confirm the exceptions list on /workers/runtime-apis/nodejs/crypto/ includes randomUUIDv7
• Confirm no other docs pages claim randomUUIDv7 support (repo search showed only this page for the false claim)

[cloudflare-docs-bot]

Review coverage

🟡 1 ownership area needs approval.

Suggested reviewers: @for-the-kidz @irvinebroque @korinne

Needs approval	Eligible approvers	Suggested
workers	@GregBrimble, @irvinebroque, @korinne, @MattieTK, @mikenomitch, @vy-ton, @WalshyDev, @cloudflare/deploy-config, @cloudflare/dev-plat-leads, @cloudflare/workers-runtime-1, @cloudflare/wrangler, @cloudflare/product-owners	for-the-kidz, irvinebroque, korinne

CODEOWNERS mappings for displayed areas (1)

Pattern	Owners
/src/content/docs/workers/	@GregBrimble, @irvinebroque, @korinne, @MattieTK, @mikenomitch, @vy-ton, @WalshyDev, @cloudflare/deploy-config, @cloudflare/dev-plat-leads, @cloudflare/workers-runtime-1, @cloudflare/wrangler, @cloudflare/product-owners

[cloudflare-docs-bot]

Review

✅ No issues found in commit 057a073.

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