NFR tests shows a consistent issue with Reconfig test

[salonichf5]

NFR pipeline runs show errors in reconfig tests related to nginx.conf not being applied correctly consistently for two runs and need to be investigated

Run 1 - #3991
Run 2 - #3960

Other issues that also need to be fixed

• TTR images do not get rendered properly for scale test Listeners.

[bjee19]

Regarding the reconfig errors, Agent's original fix was to wait between reloads. Which fixed these errors. However that caused other errors so they came up with a different solution here: nginx/agent#1250 which could have re-introduced the issue.