Fix broken CLI schema-push progress link (data?showSchema=true) (#56577)

The CLI's slow schema-push progress message links to `/data?showSchema=true`, which stopped working when the schema visualizer moved the schema modal off the Data page.

The CLI now links to `/schema?showSchema=true`, and the Schema page consumes that param by opening the schema modal (which shows schema validation progress).

The Data page also redirects `?showSchema=true` links from older CLI versions to the Schema page, preserving the `component` param, so existing installed CLIs land in the right place.

GitOrigin-RevId: 5728d9004b6d603b33d1ece83b0d01d68c6ba12e