Fix incorrect product_group value for Vault usage metrics

Why this MR ?

• To fix this issue
• For the weekly and monthly metric definitions that track usage of secrets from Vault, the product_group: value was set incorrectly.
• We need to update the existing incorrect value from environments to the correct value pipeline_security

What does this MR do ?

• Update the product_group: for weekly and monthly metric definitions that track usage of secrets from Vault
• Noticed a small typo and fixed it

References

• Issue

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