fix(hermetic-build): use public maven metadata for latest version inference (#3853)

Currently, the `get_latest_released_version()` function returns `2.59.0` for gapic-generator-java. This is not correct and is due to an ongoing issue with Maven. This PR uses the alternative `maven-metadata.xml` files instead, which contains a `metadata/versioning/latest` entry always pointing to the latest version. ```bash [hi on] diegomarquezp:~$ function get_latest_released_version() { local group_id=$1 local artifact_id=$2 group_id_url_path="$(sed 's|\.|/|g' <<< "${group_id}")" url="https://repo1.maven.org/maven2/${group_id_url_path}/${artifact_id}/maven-metadata.xml" xml_content=$(curl -s --fail "${url}") latest=$(xmllint --xpath 'metadata/versioning/latest/text()' - <<< "${xml_content}") if [[ -z "${latest}" ]]; then echo "The latest version of ${group_id}:${artifact_id} is empty." echo "The returned json from maven.org is invalid: ${json_content}" exit 1 else echo "${latest}" fi } [hi on] diegomarquezp:~$ get_latest_released_version com.google.api gapic-generator-java 2.60.0 ```

Author: diegomarquezp

hermetic_build/library_generation/owlbot/templates/java_library/.github/scripts/update_generation_config.sh

@@ -15,8 +15,10 @@ set -e
 function get_latest_released_version() {
  local group_id=$1
  local artifact_id=$2
- json_content=$(curl -s "https://search.maven.org/solrsearch/select?q=g:${group_id}+AND+a:${artifact_id}&core=gav&rows=500&wt=json")
- latest=$(jq -r '.response.docs[] | select(.v | test("^[0-9]+(\\.[0-9]+)*$")) | .v' <<< "${json_content}" | sort -V | tail -n 1)
+ group_id_url_path="$(sed 's|\.|/|g' <<< "${group_id}")"
+ url="https://repo1.maven.org/maven2/${group_id_url_path}/${artifact_id}/maven-metadata.xml"
+ xml_content=$(curl -s --fail "${url}")
+ latest=$(xmllint --xpath 'metadata/versioning/latest/text()' - <<< "${xml_content}")
  if [[ -z "${latest}" ]]; then
  echo "The latest version of ${group_id}:${artifact_id} is empty."
  echo "The returned json from maven.org is invalid: ${json_content}"

hermetic_build/library_generation/owlbot/templates/java_library/.github/workflows/update_generation_config.yaml

@@ -30,6 +30,9 @@ jobs:
  with:
  fetch-depth: 0
  token: ${{ secrets.CLOUD_JAVA_BOT_TOKEN }}
+ - name: Install Dependencies
+ shell: bash
+ run: sudo apt-get update && sudo apt-get install -y libxml2-utils
  - name: Update params in generation config to latest
  shell: bash
  run: |