CloudAsset: Update asset lib to v1 for ListAssets sample code

[peter-zheng-g]

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

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Fixes #<issue_number_goes_here> ☕️

[gcf-merge-on-green]

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[peter-zheng-g]

Not familiar with the process. May I ask what's the blocking issue for this PR? Thanks!

[averikitsch]

@Neenu1995 do you know why the integration tests and owlbot are not runnign?

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/snippets/src/main/java/com/example/asset/ListAssetsExample.java:26, tag asset_quickstart_list_assets

You are about to delete 1 region tag.

• samples/snippets/src/main/java/com/example/asset/ListAssetsExample.java:19, tag asset_quickstart_list_assets

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[Neenu1995]

Not sure why it is not running on just this PR. Other PRs look fine. Let's try retriggering it.

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.