remove old gating fmf plan

When backporting the new gating plan (08eca983), I accidentaly left the
old plan in the repo which leads to executing both plans in gating and
wasting resources.

gating.fmf

@@ -1,54 +0,0 @@
-summary: PCS gating test plan
-description: Runs upstream tier0, tier1 and smoke tests
-
-discover:
-    how: shell
-    dist-git-source: true
-    tests:
-        # Workaround until tmt supports patching sources
-        - name: Patch sources and run autotools
-          test: ./prepare-env.sh
-          duration: 30m
-        - name: Tier 0 tests
-          test: ./builddir/pcs-*/pcs_test/suite --tier0 -v --vanilla --installed
-          duration: 10m
-        - name: Tier 1 tests
-          test: ./builddir/pcs-*/pcs_test/suite --tier1 -v --vanilla --installed
-          duration: 2h
-        - name: Smoke tests
-          test: |
-              systemctl start pcsd
-              ./builddir/pcs-*/pcs_test/smoke.sh
-          duration: 10m
-prepare:
-    - name: Install config-manager DNF plugin for enabling HA repos
-      how: install
-      package: dnf-command(config-manager)
-    - name: Enable HA repo
-      how: shell
-      script: dnf config-manager --set-enabled highavailability crb || true
-    - name: Install packages
-      how: install
-      package:
-          - autoconf
-          - automake
-          - make
-          - rpm-build
-          - ruby-devel
-          - git-core
-          - booth-site
-          - fence-agents-apc
-          - fence-agents-ipmilan
-          - fence-agents-scsi
-          - fence-virt
-          - openssl
-          - pcs
-          - pcs-snmp
-          - python3-pip
-          - python3-setuptools_scm
-          - python3-wheel
-          - rubygem-json
-          - rubygem-test-unit
-          - wget
-execute:
-    how: tmt

prepare-env.sh

@@ -1,16 +0,0 @@
-set -eo xtrace
-# Rpmbuild expects patches in the _sourcedir
-mv *.patch $TMT_SOURCE_DIR
-mkdir builddir
-rpmbuild -bp pcs.spec --nodeps --define "_sourcedir $TMT_SOURCE_DIR" \
-  --define "_builddir $(pwd)/builddir"
-# Remove pcs-web-ui in builddir for "cd pcs-*" to have exactly one match
-rm -rf builddir/pcs-web-ui-*
-cd builddir/pcs-*
-# Run autotools, use bundled dependencies from the system
-export PYTHONPATH=/usr/lib64/pcs/pcs_bundled/packages/
-export GEM_HOME=/usr/lib64/pcsd/vendor/bundle/
-./autogen.sh
-./configure
-# Remove pcs sources to make sure tests are not using any of those files
-rm -rf pcs