Print patch command line for changes detected by checkerfrawork

[romani]

It was pain for long time, but here it was longer than it should be
#15807 (comment)

We need to reuse this approach:

checkstyle/.ci/test-spelling-unknown-words.sh

Lines 98 to 100 in 67b98ab

	echo "patch $whitelist_path <<EOF"
	echo "$diff_output"
	echo "EOF"

So users can simply copy and paste command to terminal to let it work.

All we need is just special printing in log of diff content, that we already do.

[mohitsatr]

on it

[mohitsatr]

making sure , i have got this right . we are trying to do something like :

   name: Git Diff on fail
    if: failure()
    run: ./.ci/patch-checkerframework-errors.sh

this .sh file , do something like this:

echo "Please copy and paste the following to create a patch:"
echo "patch -p1 <<'EOF'"
echo "$(git diff && git diff)"
echo "EOF"

[romani]

yes,
we do now:

checkstyle/.github/workflows/checker-framework.yml

Lines 56 to 58 in d7c12da

	- name: Git Diff on fail
	if: failure()
	run: git diff && git diff > target/checker-${{ matrix.profile }}.patch

one more patch printing:

checkstyle/.github/workflows/pitest.yml

Lines 77 to 83 in d7c12da

	- name: Patch command for pitest-${{ matrix.profile }}
	if: failure()
	run: |
	printf "\nTo patch suppression list run:\n\n"
	GIT_DIFF=$(git diff)
	printf "patch -p1 << EOF\n%s\nEOF" "$GIT_DIFF"
	exit 1

---

/.ci/patch-checkerframework-errors.sh

lets try to make shell file that is generic to where it is used, so can be used any where.
/.ci/print-diff-as-patch.sh