DAOS-14718 test: Fix reading of DAOS_TEST_INSECURE_MODE envar (#13441)

[tanabarr]

The ConfigGenerateRun tests fail to use certs because insecure mode is
enabled when trying to access non-existent DAOS_INSECURE_MODE env. Fix
by updating env keyname to DAOS_TEST_INSECURE_MODE.

Before requesting gatekeeper:

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[daosbuild1]

LGTM. No errors found by checkpatch.

[github-actions]

Bug-tracker data:
Ticket title is 'ConfigGenerate tests failing due to certificate location issue'
Status is 'Awaiting backport'
Labels: 'ci_impact,weekly_test'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-14718

[phender]

I've kicked off https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-13560/2/ to run control/config_generate_run.py (a weekly test not run with the default tags).

[daosbuild1]

LGTM. No errors found by checkpatch.

[tanabarr]

@phender Jenkins seems to have passed but some of the checks seem to have not started, what should I do in this instance?

[phender]

@phender Jenkins seems to have passed but some of the checks seem to have not started, what should I do in this instance?

Everything ran as intended and the build is complete. I kicked off a manual build to only run the control/config_generate_run.py tests with https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-13560/2/parameters/ since the previous run did not run this test.

[tanabarr]

@phender thanks for the response, so can we land this then please?