fix: report the real Actor name length limit

[l2ysho]

Note

Lets test apify-factory auto approve on this PR.

What changed

validateActorName in src/lib/utils.ts:

• Max-length message: The Actor name must be a maximum of 30 characters long. → `The Actor name must be at most ${ACTOR_NAME.MAX_LENGTH} characters long.`
• Min-length message: hard-coded 3 → ${ACTOR_NAME.MIN_LENGTH}

Why

ACTOR_NAME.MAX_LENGTH from @apify/consts is 63, not 30. A user with a 40-character name was rejected by a message that told them a limit the code does not enforce. The min-length value was correct but carried the same drift risk, so both now read from the constants.

Notes for the reviewer

• No test or doc asserted either literal — grep -rn "characters long" hits only these two lines.
• Pre-existing bug, not introduced by apify/apify-cli#1479. Found while reviewing that PR, because the new apify init --yes failure path surfaces these messages more often.
• pnpm run lint && pnpm run format && pnpm run build && pnpm run test:local all pass (687 passed, 4 skipped).
• No update-docs run needed: no flag, arg, description, or command changed.

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