Changes to List Organizations

for the query request parameter search, the type was generalized from string to no type

added BillingTierType to the items/usage_limits/allOf[subschema #1: UsageLimits]/billing_tier response property allOf list for the response status 200

removed BillingTier from the items/usage_limits/allOf[subschema #1: UsageLimits]/billing_tier response property allOf list for the response status 200

the billing_tier response's property default value changed from free to trial for the status 200

the mau response's property default value changed from 1000 to 5000 for the status 200

the tenants response's property default value changed from 20 to 50 for the status 200

the usage_limits response's property default value changed from {"mau":1000,"tenants":20,"billing_tier":"free"} to {"mau":5000,"tenants":50,"billing_tier":"trial"} for the status 200