Point Reporting Mode tests to xrplcluster

[nkramer44]

ReportingModeMainnetEnvironment was previously pointed at https://s2-reporting.riple.com which was recently shut down. https://xrplcluster.com is powered by reporting mode servers, so this PR changes ReportingModeMainnetEnvironment to point to xrplcluster.com

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7f40733) 91.10% compared to head (8e43c5d) 91.10%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #494   +/-   ##
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  Coverage     91.10%   91.10%           
  Complexity     1626     1626           
=========================================
  Files           319      319           
  Lines          4553     4553           
  Branches        377      377           
=========================================
  Hits           4148     4148           
  Misses          276      276           
  Partials        129      129           

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[sappenin]

Looks like the Reporting IT failed due to Clawback and AMM, so that feels like a "passing test" (i.e., shouldn't block this PR). We should probably make a way to twiddle features off for a given environment. I've updated #266 with this idea.

@nkramer44 can you post here if this should merge via an admin override exception (for now)?

[nkramer44]

@sappenin yes, we've been merging PRs that only fail testnet reporting ITs due to clawback and AMMs, and have no problems doing so here. Merging.