fix: DB tunnel fails with high frequency

[davidgamez]

Summary:

Add retry loop to DB tunnel creation. This PR adds retries every 5 seconds 12 times for a maximum waiting time of 60 seconds.

Fixes #825

Expected behavior:

DB tunnel is consistently created.

Testing tips:

Run the tunnel_create.sh against an environment where the bastion is down. This will increase the probability of seeing the retry and success messages at least once.

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• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
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