fix(replay): Don't mangle private rrweb property (#7033)

Add rrweb's `_cssText` property to the list of reserved properties to be excluded from mangling.

Author: Lms24

rollup/plugins/bundlePlugins.js

@@ -119,6 +119,8 @@ export function makeTerserPlugin() {
           // We want to keept he _replay and _isEnabled variable unmangled to enable integration tests to access it
           '_replay',
           '_isEnabled',
+          // We also can't mangle rrweb private fields when bundling rrweb in the replay CDN bundles
+          '_cssText',
           // We want to keep the _integrations variable unmangled to send all installed integrations from replay
           '_integrations',
         ],