fix: silence aws-sdk deprecation warnings

[g-tejas]

Problem

The aws-sdk v2 for Javascript is deprecated end of next year but we get the error message on every single test ran, which gets very very cluttered and reduces the noise to signal ratio. It's also painful to sift through the messages to see what the actual error was with thousands of these messages.

This PR silences them during the workflow runs

Breaking Changes

• [x] No - this PR is backwards compatible

New environment variables:

• AWS_SDK_JS_SUPPRESS_MAINTENANCE_MODE_MESSAGE : Silences the aws-sdk deprecation warnings

[g-tejas]

• #7445 👈
• develop

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