Add Azure Workload Identity proposal#16

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Mossaka wants to merge 3 commits intospinframework:mainfrom

Commits on Feb 18, 2025

Add Azure Workload Identity proposal
Mossaka
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Commits on Feb 21, 2025

modify the workloadidentity field and behaviours of the operator
Mossaka
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Commits on Mar 20, 2025

updated the proposal with new spin azure plugin to align with the current implementation
Mossaka
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