feat: add organizations into ecosystem (BE/FE)

[bhavanakarwade]

**User Story:

• As an ecosystem lead, I should be able to add my organizations to my ecosystem.

Backend :

• [x] Develop a POST API to add organizations to the Ecosystem
• [x] Modify a GET API to fetch all organizations by organization role
• [x] Error handling

Frontend:

• [x] Integrate GET API to get a list of owner organizations
• [x] Integrate POST API to add organizations in the ecosystem
• [x] Develop UI to show organization list
• [x] Provide functionality to select multiple organizations on multiple pages