Add pscale deploy-request update - #1352

edit only toggled auto-apply. Make update the primary command (with edit as an alias) and add --auto-delete-branch, the same flag as deploy-request create.

pscale deploy-request update mydb 12 --enable-auto-apply --org myorg
pscale deploy-request update mydb 12 --auto-delete-branch --org myorg
pscale deploy-request update mydb 12 --auto-delete-branch=false --org myorg
pscale dr edit mydb 12 --enable-auto-apply --org myorg

Notes:

• At least one setting is required. Unset flags are not sent (--auto-delete-branch=false is an explicit change).
• Both settings in one invocation make two API calls (PUT …/auto-apply and PUT …/auto-delete-branch).
• --auto-apply enable|disable remains as a deprecated alias for the auto-apply flags.