Bug fixes and improvements to the console settings page

[pavinduLakshan]

Purpose

• Reuse the business logic for determining available userstores in user assign view in individual roles

Previously the userstore dropdown in the user assign view in individual roles was populated based on a hardcoded disabled userstore list. The business logic is improved with this PR to dynamically check for the active status of each userstore available and display only the active userstores in the dropdown.

• Fix userstore not being appended in retrieving admins in root org console settings in managed deployment

• [Pass active user store externally to user assign view in role edit view under console roles, only if the current organization is a first level organization

Related Issues

• N/A

Related PRs

• N/A

Checklist

• [ ] e2e cypress tests locally verified. (for internal contributers)
• [x] Manual test round performed and verified.
• [ ] UX/UI review done on the final implementation.
• [ ] Documentation provided. (Add links if there are any)
• [ ] Relevant backend changes deployed and verified
• [ ] Unit tests provided. (Add links if there are any)
• [ ] Integration tests provided. (Add links if there are any)

Security checks

• [x] Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines
• [ ] Ran FindSecurityBugs plugin and verified report
• [x] Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 31.79%. Comparing base (75e78b2) to head (a9df7da). Report is 19 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #7050 +/- ## ======================================= Coverage 31.79% 31.79% ======================================= Files 41 41 Lines 890 890 Branches 216 206 -10 ======================================= Hits 283 283 - Misses 557 607 +50 + Partials 50 0 -50 ``` | [Flag](https://app.codecov.io/gh/wso2/identity-apps/pull/7050/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2) | Coverage Δ | | |---|---|---| | [@wso2is/core](https://app.codecov.io/gh/wso2/identity-apps/pull/7050/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2) | `31.79% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2#carryforward-flags-in-the-pull-request-comment) to find out more. [see 14 files with indirect coverage changes](https://app.codecov.io/gh/wso2/identity-apps/pull/7050/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2)

[wso2-jenkins-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

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