Exclude un-neccessary files from dist

### Problem Statement

Not needed runtime:
- `vendor/sentry/sentry/scripts/bump-version.sh`

May trigger vulnerability report, that package installed shell script, so better just skip it via .gitattributes

### Solution Brainstorm

Also review other files that don't deserve to be in composer dist.

Start by checking the repository's .gitattributes rules and how the composer dist archive is assembled. Exclude vendor/sentry/sentry/scripts/bump-version.sh, then review the archive contents for other files that should not ship and verify the resulting dist package omits them.

Written by the indexing model from the issue text.