ci(*:skip): Move all Python scripts under dev into devtool

[danieljanes]

Merge after #6654

This PR moves all Python scripts under dev into devtool

[Copilot]

Pull request overview

This PR migrates developer Python utilities into the dev/devtool package and updates docs and CI workflows to invoke these tools via python -m devtool.<module>.

Changes:

• Update various docs/workflows to use python -m devtool.* (and python -m poetry ...) instead of calling scripts by path.
• Refactor devtool scripts to use repo-root-relative paths (Path(__file__).resolve().parents[2]) and improve file handling (e.g., UTF-8 reads/writes).
• Adjust CI workflows (path filters, dependency install steps, wheel install syntax) to align with the new tooling and packaging.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
framework/docs/source/how-to-upgrade-to-flower-1.0.rst	Updates Poetry upgrade instructions and command invocation.
framework/docs/source/contributor-how-to-write-documentation.rst	Updates local doc build commands to use python -m poetry.
framework/docs/source/contributor-how-to-set-up-a-virtual-env.rst	Minor wording update around Poetry virtualenv setup.
framework/docs/source/contributor-how-to-install-development-versions.rst	Updates Poetry reinstall instructions and command invocation.
dev/devtool/update_python.py	Adjusts internal glob patterns to match new dev/devtool script locations.
dev/devtool/update_html_themes.py	Makes script repo-root aware and uses explicit UTF-8 when reading YAML.
dev/devtool/check_pr_title.py	Refactors into functions and enables python -m devtool.check_pr_title execution.
dev/devtool/build_example_docs.py	Switches to Path for repo-root/index handling and uses UTF-8 for output.
dev/changelog_config.toml	Updates comment to reflect new devtool.check_pr_title module usage.
.github/workflows/repo-check-pr-title.yml	Switches title check to module invocation with PYTHONPATH=dev.
.github/workflows/framework-test.yml	Expands change detection to include dev/devtool/**; renames a step.
.github/workflows/framework-e2e.yml	Installs wheel as flwr[simulation] @ URL and tweaks dependency install scope.
.github/workflows/framework-docs-update-translations.yml	Removes explicit pip install sphinx==... line during install.
.github/workflows/datasets-test.yml	Expands workflow path triggers to include dev/devtool/**.
.github/workflows/build-deploy-non-framework-docs.yml	Switches dev scripts to module invocation via devtool.*.
.devcontainer/post-create.sh	Changes Poetry install flags to --all-extras.

Comments suppressed due to low confidence (1)

dev/devtool/build_example_docs.py:24

• There is still a repo script (intelligence/dev/build-docs.sh) invoking the old path python3 dev/build-example-docs.py. Since this PR migrates/renames that script to dev/devtool/build_example_docs.py (and CI now uses python -m devtool.build_example_docs), that remaining caller will break and should be updated to the new module invocation (or to the new file path).

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[panh99]

LGTM!