fix(snowflake): drop the oversized credential modal help text (#6475)

The paragraph under the token field ran 313 characters — three times the
typical provider's and 50% longer than the next worst — and pushed the account
host field down the modal. Its content (expiry, role restriction, the
network-policy requirement per user type) already lives on the setup guide the
modal links, and the network-policy cause is repeated in the rejection copy,
which is when someone actually needs it.

apps/sim/lib/credentials/token-service-accounts/descriptors.ts

@@ -412,8 +412,6 @@ export const TOKEN_SERVICE_ACCOUNT_DESCRIPTORS: Record<
       },
     ],
     docsUrl: 'https://docs.sim.ai/integrations/snowflake-service-account',
-    helpText:
-      'A programmatic access token acts as the Snowflake user that owns it, or as the single role it was restricted to. It always expires — 15 days by default, 365 at most — and every user type except SERVICE_AGENT must be covered by a network policy to authenticate with it, unless an authentication policy waives that.',
     invalidCredentialsHelp:
       'Snowflake rejected this token. Check that it belongs to a user on this exact account host, that it has not expired or been revoked, that a network policy allows Sim to reach the account, and that the SQL API is enabled for the account.',
   },