fix: add backoff also to postgresql

[Al-Pragliola]

Description

Applying the same logic from #1246 to postgresql

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[pboyd]

/lgtm

[rareddy]

Maybe we should extract the connection as a Strategy and apply it across?

[tarilabs]

thank you @Al-Pragliola

• #1263 (review)

/approve

[google-oss-prow]

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