Address review feedback on security knowledge promotion

- do-not-grant-rights-beyond-a-users-entitlement.md: drop the See sample
  reference to a .good.al file that does not exist
- Remove the 'Contributions welcome' boilerplate line from
  compose-permission-sets, prefer-oauth2, and protect-sensitive-data
- protect-sensitive-data-in-temporary-tables: remove the pointless
  DeleteAll on the locally scoped temp buffer in the good sample and
  reword Best Practice to note local buffers are cleaned up automatically
- Drop guard-bulk-operations-with-istemporary from the promotion; it
  stays in the community layer pending a decision on whether it is security

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/security/protect-sensitive-data-in-temporary-tables.good.al

@@ -19,9 +19,6 @@ codeunit 50100 "Customer Temp Processor"
         until Customer.Next() = 0;
 
         ProcessCustomerBuffer(TempCustomer);
-
-        // Explicit cleanup on the normal exit path.
-        TempCustomer.DeleteAll();
         exit(true);
     end;