{CosmosDB} | Getting location from the Resource Group Name

[RakeshMohanMSFT]

Fixes #17978.
Though we say location parameter is optional we still expect it to be provided https://docs.microsoft.com/en-us/powershell/module/az.cosmosdb/new-azcosmosdbaccount?view=azps-8.0.0. This change will fix that issue.

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[VeryEarly]

• please test your code locally
• please update https://github.com/RakeshMohanMSFT/azure-powershell/blob/patch-1/src/CosmosDB/CosmosDB/ChangeLog.md

[VeryEarly]

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[VeryEarly]

please update https://github.com/RakeshMohanMSFT/azure-powershell/blob/patch-1/src/CosmosDB/CosmosDB/ChangeLog.md

[RakeshMohanMSFT]

please update https://github.com/RakeshMohanMSFT/azure-powershell/blob/patch-1/src/CosmosDB/CosmosDB/ChangeLog.md

Done

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