[TSP Migration][cost-management] Migrate cost-managementto TypeSpec

[melina5656]

Migrate cost-managementto TypeSpec

[github-actions]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ This PR has at least one breaking change (label: BreakingChangeReviewRequired).
  To unblock this PR, follow the process at aka.ms/brch.
• ❌ The required check named Summarize PR Impact has failed. Refer to the check in the PR's 'Checks' tab for details on how to fix it and consult the aka.ms/ci-fix guide

Important checks have failed. As of today they are not blocking this PR, but in near future they may.
Addressing the following failures is highly recommended:

• ⚠️ The check named Swagger BreakingChange has failed. To unblock this PR, follow the process at aka.ms/brch.

Comment generated by summarize-checks workflow run.

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Swagger	Microsoft.CostManagement
TypeSpec	Microsoft.CostManagement