We shouldn't replace the url if dialogflow_cx_custom_endpoint is set.

[ArtoriaRen]

This commit fixes the issue and adds a test.

dialogflowcx: fixed using `dialogflow_cx_custom_endpoint` with `Flow` 

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 9 files changed, 197 insertions(+), 30 deletions(-))
google-beta provider: Diff ( 9 files changed, 197 insertions(+), 30 deletions(-))
Open in Cloud Shell: Diff ( 4 files changed, 148 insertions(+))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 9 files changed, 197 insertions(+), 30 deletions(-))
google-beta provider: Diff ( 9 files changed, 197 insertions(+), 30 deletions(-))
Open in Cloud Shell: Diff ( 4 files changed, 148 insertions(+))

[modular-magician]

Tests analytics

Total tests: 30
Passed tests: 29
Skipped tests: 0
Affected tests: 1

Click here to see the affected service packages

• dialogflowcx

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccDialogflowCXFlow_dialogflowcxFlowCustomEndpointExample

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[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccDialogflowCXFlow_dialogflowcxFlowCustomEndpointExample [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[modular-magician]

Tests analytics

Total tests: 30
Passed tests: 30
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• dialogflowcx

🟢 All tests passed!

View the build log

[github-actions]

@trodge This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[github-actions]

@GoogleCloudPlatform/terraform-team @trodge This PR has been waiting for review for 1 week. Please take a look! Use the label disable-review-reminders to disable these notifications.