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Migrate conda packaging to rattler-build (v1 recipe format) for GitHub Actions CI (#3031)

## Add rattler-build support for GitHub Actions CI

### Summary
This PR adds rattler-build as the package-building tool for the Conda
package GitHub Actions workflow, alongside a new `rattler_recipe.yaml`
(v1 recipe schema) generated from the existing `meta.yaml`.

`meta.yaml` is left untouched and fully functional. This PR only changes
what runs on GitHub Actions; it does not retire or replace the
`conda-build` path.

### What changed

- `.github/workflows/conda-package.yml`: build steps now call
rattler-build instead of conda-build

- `conda-recipe/rattler_recipe.yaml`: new file, the rattler-build (v1
schema) equivalent of `meta.yaml`. A handful of things had to be
restructured because v1 format must always be valid plain YAML (no Jinja
control-flow blocks)

- `environments/build_conda_pkg.yml`: no longer needed for use

### Why these specific changes were needed

- CONDA_BLD path — `rattler-build` outputs to `output/<platform>/`
relative to the working directory by default, unlike `conda-build`'s
$CONDA_PREFIX/conda-bld/

- `Compute version from git describe` step — `conda-build` runs `git
describe` internally before rendering to populate
GIT_DESCRIBE_TAG/GIT_DESCRIBE_NUMBER. `rattler-build` has no equivalent,
so `rattler_recipe.yaml` now reads these via `env.get(...)`, and we
compute + export them ourselves beforehand.

- RATTLER_CHANNELS array — `channels-list` includes
`--override-channels`, which `rattler-build`'s CLI doesn't recognize, so
it's stripped before use. Expanded into a bash array (instead of a bare
$VAR) so each `-c <channel>` reaches `rattler-build` as a separate
argument — also fixes a shellcheck SC2086 warning.

- Removed usage of `conda-verify` — it's a conda-build-specific
post-build checker; `rattler-build` validates internally, so it's no
longer needed.

- Removed the two guard blocks and the `pyproject.toml` loop in
`rattler_recipe.yam... (continued)

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