* Fix TestBackoffRetry in otlp retry pkg
The delay of the retry is within two times a randomization factor (the
back-off time is delay * random number within [1 - factor, 1 + factor].
This means the waitFunc in TestBackoffRetry needs to check the delay is
within an appropriate delta, not equal to configure initial delay.
* Fix delta value
* Fix delta
Co-authored-by: Aaron Clawson <Aaron.Clawson@gmail.com>
* Centralize the retry package for the otlp exporters
* Add dependabot config
* Use unified internal/retry module in otlp exporters
* Remove otlpmetric and otlptrace internal/retry module
* Run go mod tidy in otlp{metric,trace}
