remove prompt=consent in favor of prompt=select_account

[seanstory]

part of https://github.com/elastic/enterprise-search-team/issues/3948

This is based off of https://github.com/elastic/ent-search/pull/7352/files, but for connector packages

Checklists

Pre-Review Checklist

• [ ] Covered the changes with automated tests
• [x] Tested the changes locally
• [x] Added a label for each target release version (example: v7.13.2, v7.14.0, v8.0.0)
• [x] Considered corresponding documentation changes

Changes Requiring Extra Attention

• [x] Security-related changes (encryption, TLS, SSRF, etc)

Related Pull Requests

• normal connectors: https://github.com/elastic/ent-search/pull/7352/files
• docs: https://github.com/elastic/enterprise-search-pubs/pull/3201

Release Note

Fixes a bug where Sharepoint Online Connector Packages couldn't be connected by non-global-admins, even if admin consent was granted.

For Elastic Internal Use Only

• [x] Considered corresponding documentation changes to contribute separately
• [ ] Built gems (both connectors_utility and connectors_service) and included into Enterprise Search and tested that Enterprise Search works well with new gem versions. Instruction can be found here
  • not doing this, since we aren't actually fixing old version of enterprise search, but the connector package just happens to live in this old branch