Checklist:

• I've included steps to reproduce the bug.
• I've included the version of argo rollouts.

Describe the bug

I've been trying to use the on-experiment- triggers to send slack notifications due to an issue that seems similar to #3535 - the experiment object in the trigger has the pre reconciliation state of the experiment, which means I cannot use it to send the error message, or analysis results.

To Reproduce

Create an experiment, and use one of the on-experiment-xxx triggers. In the trigger template, trying to use something like .rollout.status.phase (also not clear why there is only a .rollout object even though when examined you get an Experiment object).
For example, when an experiment fails, we get status Pending.

Expected behavior

I expected to be able to use the experiment object to send the slack notification to users, such as the failure message, failing analysis.
Ideally I'd also have wanted that the context would include the queries and measurements from the analysis runs.

Version

Tested in 1.7.2 in production cluster, but reproduced in 1.8.0-rc1 and master branch locally.

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