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Fix the following data races reported by `go test -race` in CI:

* Concurrent access of fakeContext.deployed set in worker/deployer tests
* Overwriting global http.DefaultClient's Jar field in cmd/jujud/agent tests (fixed in juju/http repo)

This fixes the actual "WARNING: DATA RACE" issues reported by ... though I think there are other issues with the unittests-race job that aren't actual data races.

See related fix: #12159


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Simple, secure and stable devops tooling. Juju keeps complexity low and productivity high. Built to manage today’s complex application architectures wherever they are run.

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