fix: Add missing executable, add new user_agent setting, use PyPI distribution in pip_url in tap-pypistats

[edgarrmondragon]

No description provided.

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[github-actions]

Testing plugin tap-pypistats (edgarrmondragon variant):

Starting test job...
...
Job completed.

Usage info

melty-bot % tap-pypistats --help
usage: tap-pypistats [-h] -c CONFIG

options:
  -h, --help            show this help message and exit
  -c CONFIG, --config CONFIG
                        The path to the configuration file.

Detected capabilities

• ❌ 'discover'
• ❌ 'catalog'
• ❌ 'properties'
• ❌ 'state'
• ❌ 'about'