ci(common): Update component version only if tag doesn't exist

If the merged PR is a few commits behind master, the merge commit could
show changes in the version files as well. This fix checks if the
version already exists and updates the envirionment only if the tag
is not present.

ci/detect_component_bump

@@ -9,7 +9,7 @@ fi
 
 for comp in  `ls components`; do
 if git log -1 -m --name-only --pretty="" | grep -q components/${comp}/idf_component.yml; then
-    echo "${comp}: Component version has been updated"
+    echo "${comp}: Component version file has changed"
     version=`grep version: components/${comp}/.cz.yaml`
     version=${version#*version: }
 
@@ -17,7 +17,11 @@ if git log -1 -m --name-only --pretty="" | grep -q components/${comp}/idf_compon
     tag_format=${tag_format#*tag_format: }
 
     eval tag=$tag_format
-
+    # check if the tag is already created
+    if [ $(git tag -l "$tag") ]; then
+        echo "${comp}: version (${tag}) already exits"
+    else
+        echo "${comp}: Component version has been updated to ${version}"
         # creates release notes from the last entry (between first two "## sections")
         awk '/^## \[/{a++};{if(a==1){print}}' components/${comp}/CHANGELOG.md > release_notes.md
 
@@ -31,6 +35,7 @@ if git log -1 -m --name-only --pretty="" | grep -q components/${comp}/idf_compon
         echo "BUMP_TAG=${tag}" >> "$GITHUB_ENV"
 
         exit 0;
+    fi
 fi
 done
 echo "No changes in component version file"