[Replicator] - update docs with current changes

[alexlave100]

• Removed all "Private Preview"/"preview state" language.
• Tightened the intro, fixed a couple of broken sentences (e.g. "When the replication is triggered using the LocalStack CLI, which must run in a shell...").
• Fixed a real bug: JSON examples used "identifier" inside replication_job_config; the actual field is resource_identifier.
• Fixed a stale claim that batch replication only supports AWS::SSM::Parameter — it now covers several resource types (see the table).
• Documented two flags that existed in code but were never written up: --source-region-name (cross-region source discovery) and --extra-config KEY=VALUE (e.g. RDS master_user_password), plus the ignore_already_existing option to skip already-existing targets instead of failing the job.
• Corrected the job-status JSON examples: the real response uses "resources": {"succeeded": [...], "failed": [...], "skipped": [...]} at the top level, not the "result": {"resources_succeeded": N, ...} shape the docs previously showed (which doesn't match current code).
• Added the previously-undocumented GET /_localstack/replicator/jobs (list all jobs) endpoint.
• Cleaned up quickstart formatting bugs and stray blank lines.

Fixes DPX-575 DOC-366

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[quetzalliwrites]

thanks for your contribution @alexlave100!

Noting it's still in draft mode... is that intentional?

[alexlave100]

thanks for your contribution @alexlave100!

Noting it's still in draft mode... is that intentional?

@quetzalliwrites yes, I'm still collecting some feedback from the rest of the team. I'll release the PR in due time

[quetzalliwrites]

@alexlave100 excellent, thank you for confirming.

Before you create a PR you need to create a documentation ticket in linear. You also need to reference your linear ticket in this PR.

Remember to take care of that before you put this in review mode.