Revert ".cirrus.yml: Reenable CI with pre-commit CI scripts"

This reverts commit 676d64ee83.

These tests take a combined 3h to run and are consuming our montly
Cirrus-CI credits in short order, before failing.

In the PR markj reports that the failure appeared somewhere between:

good: da64f6e047
bad:  b197d2abcb

Unfortunately, even after we find the offending commit and have a fix we
still do not have sufficient monthly compute credit.  Disable these
tests for now, pending a solution to both issues.

PR:		289696
Reviewed by:	ngie
Differential Revision: https://reviews.freebsd.org/D52618

.cirrus.yml

@@ -194,11 +194,13 @@ precommit_task:
   matrix:
     - name: amd64 smoke test using internal ci systems
       only_if: $CIRRUS_REPO_FULL_NAME != 'freebsd/freebsd-src' || $CIRRUS_BRANCH =~ 'pull/.*'
+      trigger_type: manual
       env:
         TARGET: amd64
         TARGET_ARCH: amd64
     - name: aarch64 smoke test using internal ci systems
       only_if: $CIRRUS_REPO_FULL_NAME != 'freebsd/freebsd-src' || $CIRRUS_BRANCH =~ 'pull/.*'
+      trigger_type: manual
       env:
         TARGET: arm64
         TARGET_ARCH: aarch64