AzureKeyVaultV2 task should not always encode percents

[tejasd1990]

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Question, Bug, or Feature?
Bug

Enter Task Name: AzureKeyVaultV2

list here (V# not needed):
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Environment

• Server - Azure Pipelines or TFS on-premises?
  NA

• Agent - Hosted or Private:
  NA

Issue Description

the task always encodes % to %AZP25 while setting the secrets as pipeline variables. This is wrong if DECODE_PERCENTS has been explicitly set to false in the pipeline, since when the agent reads the values for subsequent tasks, it won't decode %AZP25 back to %. This encoding should be done based on the condition that DECODE_PERCENTS is not false, it can be true, or not set(which defaults to true)

Task logs

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Troubleshooting

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Error logs

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