azurerm_network_watcher_flow_log: fix updating tags on existing resource

[jkroepke]

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Description

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

While integrating the bug fix, I saw that there is already a test case. I tried to run the test without my bug fix and it turns out that this existing test failed. Thats the reason, why I do not introduce a new test case.

Before:

=== RUN   TestAccNetworkWatcher/FlowLog/tags
    testcase.go:180: Step 3/4 error: After applying this test step, the non-refresh plan was not empty.
        stdout:
        
        
        Terraform used the selected providers to generate the following execution
        plan. Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          # azurerm_network_watcher_flow_log.test will be updated in-place
          ~ resource "azurerm_network_watcher_flow_log" "test" {
                id                        = "/subscriptions/a78e11bf-66d8-4aae-b171-cc43ced4e6ca/resourceGroups/acctestRG-watcher-2409131411/providers/Microsoft.Network/networkWatchers/acctest-NW-240913142913405111/flowLogs/flowlog-240913142913405111"
                name                      = "flowlog-240913142913405111"
              ~ tags                      = {
                  ~ "env" = "Test" -> "Prod"
                }
                # (7 unchanged attributes hidden)
        
                # (1 unchanged block hidden)
            }
        
        Plan: 0 to add, 1 to change, 0 to destroy.
--- FAIL: TestAccNetworkWatcher/FlowLog/tags (166.44s)

After:

=== RUN   TestAccNetworkWatcher
=== RUN   TestAccNetworkWatcher/FlowLog
=== RUN   TestAccNetworkWatcher/FlowLog/tags
--- PASS: TestAccNetworkWatcher/FlowLog/tags (241.50s)
--- PASS: TestAccNetworkWatcher/FlowLog (241.50s)
--- PASS: TestAccNetworkWatcher (241.50s)
PASS

Process finished with the exit code 0

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_network_watcher_flow_log - fix update tags on existing resources [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27385

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[stephybun]

Thanks @jkroepke LGTM 👍