Add support for description to tag template fields

[melinath]

Upstreams hashicorp/terraform-provider-google#8811. Resolves hashicorp/terraform-provider-google#8810.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

datacatalog: added `description` field to `google_data_catalog_tag_template ` resource

[google-cla]

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In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 25 insertions(+))
Terraform Beta: Diff ( 4 files changed, 27 insertions(+), 3 deletions(-))
TF Conversion: Diff ( 1 file changed, 11 insertions(+))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=180196"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComputeNetworkPeeringRoutesConfig_networkPeeringRoutesConfigGkeExample|TestAccContainerCluster_withILBSubsetting|TestAccContainerCluster_withAuthenticatorGroupsConfig|TestAccContainerCluster_regionalWithNodePool|TestAccContainerCluster_withTpu|TestAccContainerCluster_withPrivateClusterConfig|TestAccContainerCluster_withIntraNodeVisibility|TestAccContainerNodePool_nodeLocations|TestAccContainerNodePool_maxPodsPerNode|TestAccContainerNodePool_withGPU|TestAccContainerNodePool_regionalAutoscaling|TestAccContainerNodePool_resize|TestAccContainerNodePool_012_ConfigModeAttr|TestAccContainerNodePool_EmptyGuestAccelerator|TestAccDataprocClusterIamBinding|TestAccDataprocClusterIamMember|TestAccDataprocClusterIamPolicy|TestAccDataprocCluster_updatable|TestAccDataprocCluster_withTempBucket|TestAccDataprocCluster_withStagingBucket|TestAccDataprocCluster_withInitAction|TestAccDataprocCluster_withConfigOverrides|TestAccDataprocCluster_withServiceAcc|TestAccDataprocJobIamBinding|TestAccDataprocJobIamMember|TestAccDataprocJobIamPolicy|TestAccDataprocJob_updatable|TestAccDataprocJob_Spark|TestAccDataprocJob_Hadoop|TestAccDataprocJob_PySpark|TestAccDataprocJob_Hive|TestAccDataprocJob_Pig|TestAccDataprocJob_SparkSql|TestAccStorageHmacKey_update You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=180303"

[modular-magician]

Tests failed during RECORDING mode: TestAccContainerCluster_withPrivateClusterConfigMissingCidrBlock|TestAccDataprocCluster_withConfigOverrides|TestAccDataprocCluster_withStagingBucket|TestAccDataprocCluster_updatable|TestAccDataprocCluster_withTempBucket Please fix these to complete your PR

[geirsagberg]

@googlebot I fixed it.

[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.

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[geirsagberg]

@googlebot I consent.

[geirsagberg]

@melinath @ScottSuarez Anything I can do to make the generate-diffs check succeed? Not quite sure what it means...

[melinath]

@geirsagberg the generage-diffs failure represents test failures, but they seem to be unrelated to this PR, so they don't block it being merged. Thanks for checking in!