Remove pkg resources and switch to importlib

[transientlunatic]

This PR removes the deprecated pkg_resources package and replaces it with importlib from the standard library.

[Copilot]

Pull request overview

This PR modernizes the package by replacing the deprecated pkg_resources with importlib from the standard library and adds support for htcondor2 alongside several other improvements.

Key Changes:

• Migrates from pkg_resources to importlib.metadata for version detection and importlib.resources for resource file access
• Adds backward compatibility for both legacy htcondor and newer htcondor2 packages
• Includes bug fixes for indentation and safe dictionary access issues

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
asimov/init.py	Replaces pkg_resources with importlib.metadata for version detection and importlib.resources for configuration file access
asimov/analysis.py	Updates resource file access from pkg_resources to importlib.resources for template files; switches to relative imports
asimov/cli/report.py	Replaces pkg_resources.resource_filename with importlib.resources.files for theme location
asimov/cli/project.py	Improves Python executable discovery with fallback to python3 and better error handling
asimov/cli/review.py	Fixes indentation of else block for proper code flow
asimov/cli/manage.py	Adds safe dictionary access with .get() to prevent KeyError exceptions
asimov/condor.py	Adds try/except for htcondor2 import with fallback to htcondor
asimov/pipeline.py	Adds try/except for htcondor2 import with fallback to htcondor
asimov/pipelines/pesummary.py	Adds try/except for htcondor2 import with fallback to htcondor
tests/test_asimov.py	Updates test to use importlib.metadata.version and PackageNotFoundError instead of pkg_resources
pyproject.toml	Changes license format from inline string to file reference; adds missing package entries
LICENSE	Updates to MIT license format with 2025 copyright
conda/environment.yaml	New file defining conda environment dependencies
tests/tmp/project/.asimov/asimov.conf	New test configuration file
tests/test_blueprints/*.yaml	New test blueprint files for GWOSC event configuration and analysis setup
.gitlab-ci.yml	Adds comprehensive htcondor integration test job
.github/workflows/htcondor-tests.yml	New GitHub workflow for HTCondor integration testing
.github/workflows/slurm-tests.yml	New GitHub workflow for Slurm integration testing
.github/workflows/python-app.yml	Updates to use pip install and adds fetch-depth for proper git history access

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