[DPE-6285] Update poetry to v2 (#527)

Currently, our CI is broken very early in its stage, even lint test is
not passing anymore. The root cause is a shift from poetry 1.8 to v2.
Examples:
* CI run 2 days ago:
https://github.com/canonical/opensearch-operator/actions/runs/12624779078
* CI run 3 days ago, lint still passes but everything else fails:
https://github.com/canonical/opensearch-operator/actions/runs/12615333344

3 days ago we were still installing poetry 1.8.5.

This PR updates our CI logic to use poetry v2.

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ on:
 jobs:
   lint:
     name: Lint
-    uses: canonical/data-platform-workflows/.github/workflows/lint.yaml@v23.1.1
+    uses: canonical/data-platform-workflows/.github/workflows/lint.yaml@v24.0.6
 
   unit-test:
     name: Unit test charm
@@ -60,6 +60,10 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Install terraform snap
+        run: |
+          sudo snap install terraform --channel=latest/stable --classic
+
       - name: lint charm module
         run: |
           pushd ./terraform
@@ -154,7 +158,7 @@ jobs:
       - lint
       - unit-test
       - build
-    uses: canonical/data-platform-workflows/.github/workflows/integration_test_charm.yaml@v23.1.1
+    uses: canonical/data-platform-workflows/.github/workflows/integration_test_charm.yaml@v24.0.6
     with:
       juju-agent-version: ${{ matrix.juju.agent }}
       juju-snap-channel: ${{ matrix.juju.snap_channel }}

.github/workflows/sync_docs.yaml

@@ -10,7 +10,7 @@ on:
 jobs:
   sync-docs:
     name: Sync docs from Discourse
-    uses: canonical/data-platform-workflows/.github/workflows/sync_docs.yaml@v21.0.1
+    uses: canonical/data-platform-workflows/.github/workflows/sync_docs.yaml@v24.0.6
     with:
       reviewers: a-velasco
     permissions:

charmcraft.yaml

@@ -47,6 +47,7 @@ parts:
 
       # Convert subset of poetry.lock to requirements.txt
       curl -sSL https://install.python-poetry.org | python3 -
+      /root/.local/bin/poetry self add poetry-plugin-export
       /root/.local/bin/poetry export --only main,charm-libs --output requirements.txt
 
       craftctl default