Feature/safo6 nrl 1841 performance tests public mode

[sandyforresternhs]

• The internal tests haven’t changed - the name of the commands have just been updated in the makefile to make it clearer they’re internal
• This pr covers the changes required for the consumer performance tests to run in public mode - the producer changes will be addressed in a subsequent pr
• Includes changes for both consumer & producer tests to be run in public mode
• Updated readme with new make commands for running these public tests, now including configuring the base URL and a simple local http server to serve up refreshed bearer auth tokens (each token is valid for 5 mins and the tests run for 36 mins, so needs refreshing mid-test run). See ticket for more info on why this approach was selected.
• Tested these new commands for both producer & consumer in public & internal modes ✅

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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[mattdean3-nhs]

Love this - nice work on the Python token handler/refresher 💪

Haven't tested it myself yet, but will give it a go later in the day.