azurerm_windows_web_app_slot - FIX node version reset to "0.12.1" during update

[Apokalypt]

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Description

Right now, the NodeJS environment variable can be unset during an update. This PR ensure that the version is correctly set if we need to update AppSettings for any reason
I also remove the duplicate code to avoid patching/updating app settings two times

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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)

Sorry but I could only run locally the tests... I've made some tests in our professional environment and it's correctly working but I will appreciate if someone can run them properly

Change Log

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

• azurerm_windows_web_app_slot - avoid "WEBSITE_NODE_DEFAULT_VERSION" to be lost during update

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)

Related to #25452 , #25488

[stephybun]

Thanks for this PR @Apokalypt but it appears that this change has introduced a regression, we have a new failing test:

------- Stdout: -------
=== RUN   TestAccWindowsWebAppSlot_completeUpdate
=== PAUSE TestAccWindowsWebAppSlot_completeUpdate
=== CONT  TestAccWindowsWebAppSlot_completeUpdate
    testcase.go:113: Step 5/6 error: After applying this test step, the 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_windows_web_app_slot.test will be updated in-place
          ~ resource "azurerm_windows_web_app_slot" "test" {
              ~ app_settings                                   = {
                  - "foo" = "bar" -> null
                }
                id                                             = "/subscriptions/*******/resourceGroups/acctestRG-240411141600104680/providers/Microsoft.Web/sites/acctestWA-240411141600104680/slots/acctestWAS-240411141600104680"
                name                                           = "acctestWAS-240411141600104680"
                tags                                           = {}
                # (18 unchanged attributes hidden)
                # (1 unchanged block hidden)
            }
        Plan: 0 to add, 1 to change, 0 to destroy.
--- FAIL: TestAccWindowsWebAppSlot_completeUpdate (718.10s)
FAIL

[Apokalypt]

Thanks for this PR @Apokalypt but it appears that this change has introduced a regression, we have a new failing test:

------- Stdout: -------
=== RUN   TestAccWindowsWebAppSlot_completeUpdate
=== PAUSE TestAccWindowsWebAppSlot_completeUpdate
=== CONT  TestAccWindowsWebAppSlot_completeUpdate
    testcase.go:113: Step 5/6 error: After applying this test step, the 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_windows_web_app_slot.test will be updated in-place
          ~ resource "azurerm_windows_web_app_slot" "test" {
              ~ app_settings                                   = {
                  - "foo" = "bar" -> null
                }
                id                                             = "/subscriptions/*******/resourceGroups/acctestRG-240411141600104680/providers/Microsoft.Web/sites/acctestWA-240411141600104680/slots/acctestWAS-240411141600104680"
                name                                           = "acctestWAS-240411141600104680"
                tags                                           = {}
                # (18 unchanged attributes hidden)
                # (1 unchanged block hidden)
            }
        Plan: 0 to add, 1 to change, 0 to destroy.
--- FAIL: TestAccWindowsWebAppSlot_completeUpdate (718.10s)
FAIL

Hmmm I may have an idea why it's happening but can't run acceptance test... I will try with my team using terraform to make some test but it may take time (next tuesday).
If I make a push in a few minutes are you able to re-run acceptance tests to check if my idea was correct ?

[Apokalypt]

@stephybun I can confirm that the test does not pass, but this is not due to my PR, since the bug is present in the normal version of "main". In fact, I've run the test without my code on version 3.97.1 (the last version before my branch was created) and the result is the same: the plan considers that the value will be removed... Imo, this bug should be fixed in another PR and not this one.

One thing to note is that, even if the plan indicates that the value will be deleted, if you apply the plan, nothing changes! The value remains as expected...

EDIT: This bug seems to be present in the last version of terraform (3.99.0)

[Apokalypt]

Changes performed as requested on the other PR

[Apokalypt]

Changes performed as requested on the other PR

[stephybun]

Tests look good. Thanks @Apokalypt LGTM 🍕