azurerm_network_watcher_flow_log: fix updating tags on existing resource

[jkroepke]

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Description

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Changes to existing Resource / Data Source

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Testing

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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 👍

[github-actions]

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