Recent Android test refactor broke HttpStress builds

[antonfirsov]

#71385 introduced a build failure in the class StressClient. The method CreateHttpClient does not exist that context:
https://github.com/dotnet/runtime/pull/71385/files#diff-a4f53800a0e6b2a16cda442c903251d398bef9226539ed6312f71bdbf3998ce4

@simonrozsival @akoeplinger when touching stress test code, please make sure to run the affected stress tests under the PR:

/azp run runtime-libraries stress-http
/azp run runtime-libraries stress-ssl

(I'm about to push a quick fix since I need it running ASAP)

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Issue Details

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#71385 introduced a build failure in the class StressClient. The method CreateHttpClient does not exist that context:
https://github.com/dotnet/runtime/pull/71385/files#diff-a4f53800a0e6b2a16cda442c903251d398bef9226539ed6312f71bdbf3998ce4

@simonrozsival @akoeplinger when touching stress test code, please make sure to run the affected stress tests under the PR:

/azp run runtime-libraries stress-http
/azp run runtime-libraries stress-ssl

(I'm about to push a quick fix since I need it running ASAP)

Author:	antonfirsov
Assignees:	antonfirsov
Labels:	area-System.Net.Http
Milestone:	7.0.0