fix: prevent infinite loop when DynamoDbClient connection fails

[wafuwafu13]

Issue #, if available:

Description of changes:

Set maximum number of retries and display errors.

test in my local environment:

$ cargo test test_create_table
...
failures:

---- test_create_table stdout ----
DynamoDB Local is up as a container: Couldn't connect: Error during dispatch: error trying to connect: dns error: failed to lookup address information: nodename nor servname provided, or not known 
 Retry after 3 seconds.
Couldn't connect: Error during dispatch: error trying to connect: dns error: failed to lookup address information: nodename nor servname provided, or not known 
 Retry after 3 seconds.
Couldn't connect: Error during dispatch: error trying to connect: dns error: failed to lookup address information: nodename nor servname provided, or not known 
 Retry after 3 seconds.
Couldn't connect: Error during dispatch: error trying to connect: dns error: failed to lookup address information: nodename nor servname provided, or not known 
 Retry after 3 seconds.
Couldn't connect: Error during dispatch: error trying to connect: dns error: failed to lookup address information: nodename nor servname provided, or not known 
 Retry after 3 seconds.
thread 'test_create_table' panicked at 'Failed to connect after 5 attempts.', tests/util/mod.rs:130:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
...

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[wafuwafu13]

same failure 🤔

https://github.com/awslabs/dynein/actions/runs/5874404878/job/15929095087
https://github.com/awslabs/dynein/actions/runs/5895991185/job/15992934684?pr=154

success now
https://github.com/awslabs/dynein/actions/runs/5895991185/job/16001288138