BI-2496 When Deleting an Experiment: "Success" message appears even if delete fails.

[davedrp]

Description

BI-2496 When Deleting an Experiment: "Success" message appears even if delete fails.

Please include a summary of the change that was made.
Read the HTTP-status code returned from bi-api and use that to display the correct banner.

Testing

1. Insure the "success" banner still appears when an experiment is successfully deleted.
2. An "error" banner should appear when the delete fails. (to insure the delete fails, I temporarily replace ExperimentController::deleteExperiment with:

   @Delete("/${micronaut.bi.api.version}/programs/{programId}/experiments/{experimentId}{?hard}")
    @ProgramSecured(roles = {ProgramSecuredRole.PROGRAM_ADMIN, ProgramSecuredRole.SYSTEM_ADMIN})
    @Produces(MediaType.APPLICATION_JSON)
    public HttpResponse deleteExperiment(
            @PathVariable("programId") UUID programId,
            @PathVariable("experimentId") UUID experimentId,
            @QueryValue(defaultValue = "false") Boolean hard
    ) throws ApiException {
        return HttpResponse.serverError();
    }

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have create/modified unit tests to cover this change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation
• I have run TAF: <link to TAF run>
• I have run SiteImprove on pages impacted by changes

[mlm483]

Tested, working.

[HMS17]

Success message appears when experiment is successfully deleted and does not appear when deletion fails!