Add retry mechanism to CosmosDB Database creation

[msexxeta]

Description

This is a workaround to the emulator container advertising it is ready when in fact it is not.

Fixes #9326
Fixes #7178

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No fixes existing unit test https://github.com/radical/aspire/blob/d57970b465f75fbe805bf101125ee9e4ef69882c/tests/Aspire.Hosting.Azure.Tests/AzureCosmosDBEmulatorFunctionalTests.cs#L271
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue (consider using one of the following templates):
      • New (or update) doc-idea template
      • New breaking-change template
      • New diagnostic template
  • No

[msexxeta]

@dotnet-policy-service agree company="Exxeta"