DUX-5115 Add startup failure error log test

[9999years]

#444 got auto-merged a bit early, oops!

I can confirm that if you comment out the change in #444 then a bunch of stuff fails:

     Summary [  83.049s] 239 tests run: 227 passed (1 leaky), 12 failed, 0 skipped
        FAIL [  36.712s] ghciwatch::error_log error_log_startup_failure_9102
        FAIL [  24.564s] ghciwatch::error_log error_log_startup_failure_9122
        FAIL [  22.095s] ghciwatch::error_log error_log_startup_failure_967
        FAIL [  33.764s] ghciwatch::error_log error_log_startup_failure_984
        FAIL [  22.941s] ghciwatch::shutdown handles_repeated_startup_failures_9102
        FAIL [  24.139s] ghciwatch::shutdown handles_repeated_startup_failures_9122
        FAIL [  25.440s] ghciwatch::shutdown handles_repeated_startup_failures_967
        FAIL [  27.936s] ghciwatch::shutdown handles_repeated_startup_failures_984
        FAIL [  27.663s] ghciwatch::shutdown handles_repeated_startup_failures_before_restart_ghci_hook_9102
        FAIL [  25.208s] ghciwatch::shutdown handles_repeated_startup_failures_before_restart_ghci_hook_9122
        FAIL [  22.660s] ghciwatch::shutdown handles_repeated_startup_failures_before_restart_ghci_hook_967
        FAIL [  31.145s] ghciwatch::shutdown handles_repeated_startup_failures_before_restart_ghci_hook_984

[linear]

DUX-5115 Test for startup error log

[9999years]

This function also calls initialize under the hood.