docs(samples): adds samples from documentation with correct region tags

[pmakani]

Fixes #369

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[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• samples/snippets/src/main/java/com/example/datacatalog/CreateCustomEntry.java:19, tag data_catalog_create_custom_entry
• samples/snippets/src/main/java/com/example/datacatalog/CreateFilesetEntry.java:19, tag data_catalog_create_fileset
• samples/snippets/src/main/java/com/example/datacatalog/GrantTagTemplateUserRole.java:19, tag data_catalog_grant_tag_template_user_role
• samples/snippets/src/main/java/com/example/datacatalog/Quickstart.java:19, tag data_catalog_quickstart
• samples/snippets/src/main/java/com/example/datacatalog/SearchAssets.java:19, tag data_catalog_search_assets

You are about to delete 1 region tag.

• samples/snippets/src/main/java/com/example/datacatalog/CreateFilesetEntry.java:19, tag datacatalog_create_fileset_tag

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[pmakani]

@googlebot I consent.

[google-cla]

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[pmakani]

@googlebot I consent

[google-cla]

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[eaball35]

[eaball35]

blocking checks

[eaball35]

Should we close this?

[codecov]

Codecov Report

Merging #392 (93b76b7) into master (443209c) will increase coverage by 1.02%.
The diff coverage is n/a.

❗ Current head 93b76b7 differs from pull request most recent head f78d2a4. Consider uploading reports for the commit f78d2a4 to get more accurate results

@@             Coverage Diff              @@
##             master     #392      +/-   ##
============================================
+ Coverage     81.20%   82.23%   +1.02%     
+ Complexity      744      595     -149     
============================================
  Files            36       24      -12     
  Lines          4917     3906    -1011     
  Branches         57       48       -9     
============================================
- Hits           3993     3212     -781     
+ Misses          823      610     -213     
+ Partials        101       84      -17     

Impacted Files	Coverage Δ
...google/cloud/datacatalog/v1/DataCatalogClient.java	86.59% <0.00%> (-0.22%)	⬇️
...cloud/datacatalog/v1/stub/GrpcDataCatalogStub.java	97.79% <0.00%> (-0.08%)	⬇️
...e/cloud/datacatalog/v1beta1/DataCatalogClient.java	86.59% <0.00%> (ø)
...ud/datacatalog/v1beta1/PolicyTagManagerClient.java	79.05% <0.00%> (ø)
...acatalog/v1/stub/PolicyTagManagerStubSettings.java
...atalog/v1/PolicyTagManagerSerializationClient.java
...cloud/datacatalog/v1/PolicyTagManagerSettings.java
...tub/PolicyTagManagerSerializationStubSettings.java
...e/cloud/datacatalog/v1/PolicyTagManagerClient.java
...g/v1/stub/GrpcPolicyTagManagerCallableFactory.java
... and 9 more

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[google-cla]

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[google-cla]

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[google-cla]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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Stephanie to review