Use release tags for Trial images

[andreyvelich]

Fixes: #1554.
I added latest tag for Trial images.
For SDK examples, I use release tags, since we are installing specific version of Katib SDK.

Also, I modified update-images script to re-use it in release and e2e tests.
Currently, this script updates all Katib images that we maintain.

Please take a look.

/assign @gaocegege @tenzen-y @anencore94 @johnugeorge

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[coveralls]

Coverage decreased (-0.08%) to 74.138% when pulling 171be75 on andreyvelich:issue-1554-trial-release-tag into 1519724 on kubeflow:master.

[tenzen-y]

LGTM 👍
/lgtm
/hold

[andreyvelich]

This PR should be ready.
/hold for the review

[anencore94]

LGTM!
just a small question: Is there some special reason to use semantic version in notebook files rather than using latest ?

[google-oss-prow]

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[andreyvelich]

Is there some special reason to use semantic version in notebook files rather than using latest

Since we install the specific version of Katib SDK in our notebooks, it's better to be consistent with the Trial images.

[andreyvelich]

/hold cancel

[andreyvelich]

@ca-scribner @DomFleischmann Any ideas why Charms can fail ?

[tenzen-y]

/lgtm