Set LeaderElectionResourceLock to leases and remove leader-election-resource parameter

[levan-m]

What does this PR do?

In Operator v1.8 we will upgrade controller-runtime and Kubernetes API dependencies which only supports leases as leader election resource lock.

Motivation

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Additional Notes

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Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

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Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.33%. Comparing base (288d981) to head (f2893b2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1237   +/-   ##
=======================================
  Coverage   59.33%   59.33%           
=======================================
  Files         177      177           
  Lines       22371    22371           
=======================================
  Hits        13273    13273           
  Misses       8286     8286           
  Partials      812      812           

Flag	Coverage Δ
unittests	59.33% <ø> (ø)

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