feat: [analytics-data] add `EmptyFilter` type to the Data API v1beta

[gcf-owl-bot[bot]]

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feat: add the empty_filter field to the Filter type docs: update documentation for theRunReport method docs: remove all references to 'GA4' in documentation

PiperOrigin-RevId: 698517184

Source-Link: https://github.com/googleapis/googleapis/commit/3a6c7dcb9e3bc6792bb9b41939a8dd2bbd6dcaf9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/db3a50c62ddad1edcc91e3791636a4317f52dd06 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWFuYWx5dGljcy1kYXRhLy5Pd2xCb3QueWFtbCIsImgiOiJkYjNhNTBjNjJkZGFkMWVkY2M5MWUzNzkxNjM2YTQzMTdmNTJkZDA2In0=

[dpebot]

/gcbrun

[dpebot]

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