fix: validate actors search choice flags

[kuntal1461]

• Fixes actors search: --pricing-model and --sort-by use options: instead of choices:, so they are never validated #1322 by changing actors search restricted flags from options to choices so CLI validation runs.
• Validates provided choice flags even when the value is an empty string.
• Adds a user-facing invalid-choice error message and regenerates CLI reference docs.

Checks:

• pnpm run lint
• pnpm run format
• pnpm run build
• pnpm run test:local

[patrikbraborec]

Hey @kuntal1461, thanks for the contribution. This is great. Just quick question -> the name of pricing models are based on docs? Cc. @l2ysho - let's check if the pricing models are correct. Thanks!

[kuntal1461]

Hi @patrikbraborec Thanks! I verified this against the Store API docs. The pricing model values used in this commit are the API enum values for the pricingModel filter: FREE, FLAT_PRICE_PER_MONTH, PRICE_PER_DATASET_ITEM, and PAY_PER_EVENT.
I also checked the commit behavior locally, and invalid values are now rejected by the CLI before the Store request is made. Happy to adjust if @l2ysho confirms a different source of truth.