feat: clean up unused DB table service_provider

- This table was added for the UAA-as-SAML-IDP feature
  (b93c87a)
- This feature has been removed:
  #2638. Hence this table is now
  unused.
- The "DROP TABLE IF EXISTS" syntax would not error out if the table
  does not exist, compared to just "DROP TABLE".
- Also clean up docs and a test util that reference this table.

[#182118433]

Author: peterhaochen47

README.md

@@ -197,7 +197,6 @@ List of relations
  public | schema_version                | table    | root
  public | sec_audit                     | table    | root
  public | sec_audit_id_seq              | sequence | root
- public | service_provider              | table    | root
  public | spring_session                | table    | root
  public | spring_session_attributes     | table    | root
  public | user_google_mfa_credentials   | table    | root

server/src/main/resources/org/cloudfoundry/identity/uaa/db/hsqldb/V4_105__Drop_Table_service_provider.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS service_provider;

server/src/main/resources/org/cloudfoundry/identity/uaa/db/mysql/V4_105__Drop_Table_service_provider.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS service_provider;

server/src/main/resources/org/cloudfoundry/identity/uaa/db/postgresql/V4_105__Drop_Table_service_provider.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS service_provider;

server/src/test/java/org/cloudfoundry/identity/uaa/test/TestUtils.java

@@ -59,7 +59,6 @@ public static void cleanAndSeedDb(JdbcTemplate jdbcTemplate) throws SQLException
         jdbcTemplate.update("DELETE FROM oauth_code");
         jdbcTemplate.update("DELETE FROM revocable_tokens");
         jdbcTemplate.update("DELETE FROM sec_audit");
-        jdbcTemplate.update("DELETE FROM service_provider");
         jdbcTemplate.update("DELETE FROM user_info");
         jdbcTemplate.update("DELETE FROM users");
         jdbcTemplate.update("DELETE FROM mfa_providers");