fix(core): Remove abs_path from stack trace (reverting #7167)

[lforst]

In #7167 we added abs_path to the stack frames inside error events. We thought we needed this to make the new debug ID source map resolving process more resilient against people using the RewritieFrames integration.

Unfortunately, this change rendered the usage of RewriteFrames completely useless in most cases because Symbolicator only looks at abs_path and not filename, and up until now, everything only worked because abs_path got backfilled by filename in Relay if it was not defined.

This PR reverts the change in #7167 and falls back to using filename for the debug ID process. This means that RewriteFrames has the possibility to screw up that system but that should be fine since 1) people who have a RewriteFrames likely already have working source maps in place 2) we can tell people to not use RewriteFrames in combination with the debug ID process.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.56 KB (-0.06% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	64.19 KB (-0.02% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	19.12 KB (-0.07% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	56.57 KB (-0.02% 🔽)
@sentry/browser - Webpack (gzipped + minified)	21.58 KB (-0.06% 🔽)
@sentry/browser - Webpack (minified)	71.65 KB (-0.02% 🔽)
@sentry/react - Webpack (gzipped + minified)	21.6 KB (-0.06% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	51.94 KB (-0.11% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	27.92 KB (-0.05% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.09 KB (-0.06% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	44.37 KB (-0.01% 🔽)
@sentry/replay - Webpack (gzipped + minified)	38.44 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	62.58 KB (-0.03% 🔽)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	56.09 KB (-0.03% 🔽)