feat(rdb): make upgrade/database/user create idempotent with no-op success messages

[jremy42]

close #4301

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
2093	2	2091	17

View the top 2 failed test(s) by shortest run time

github.com/scaleway/scaleway-cli/v2/internal/namespaces/rdb/v1::Test_UserGetURL

Stack Traces | 0s run time

=== RUN   Test_UserGetURL
--- FAIL: Test_UserGetURL (0.00s)

github.com/scaleway/scaleway-cli/v2/internal/namespaces/rdb/v1::Test_UserGetURL/With_custom_user

Stack Traces | 0.02s run time

=== RUN   Test_UserGetURL/With_custom_user
=== PAUSE Test_UserGetURL/With_custom_user
=== CONT  Test_UserGetURL/With_custom_user
    custom_url_test.go:65: 
        	Error Trace:	.../scaleway-cli/core/testing.go:780
        	            				.../scaleway-cli/core/testing.go:693
        	            				.../scaleway-cli/core/testing.go:531
        	Error:      	Not equal: 
        	            	expected: "🎲🎲🎲 EXIT CODE: 0 🎲🎲🎲\n🟩🟩🟩 STDOUT️ 🟩🟩🟩️\npostgresql://custom-user@163.172.166.66:4818\n🟩🟩🟩 JSON STDOUT 🟩🟩🟩\n\"postgresql://custom-user@163.172.166.66:4818\"\n"
        	            	actual  : "🎲🎲🎲 EXIT CODE: 1 🎲🎲🎲\n🟥🟥🟥 STDERR️️ 🟥🟥🟥️\nFailed to list users for instance \"da6946e0-7f3f-4fe4-afb3-5836dfb0d783\"\n🟥🟥🟥 JSON STDERR 🟥🟥🟥\n{\n  \"error\": \"failed to list users for instance \\\"da6946e0-7f3f-4fe4-afb3-5836dfb0d783\\\"\"\n}\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,6 +1,8 @@
        	            	-🎲🎲🎲 EXIT CODE: 0 🎲🎲🎲
        	            	-🟩🟩🟩 STDOUT️ 🟩🟩🟩️
        	            	-postgresql://custom-user@163.172.166.66:4818
        	            	-🟩🟩🟩 JSON STDOUT 🟩🟩🟩
        	            	-"postgresql://custom-user@163.172.166.66:4818"
        	            	+🎲🎲🎲 EXIT CODE: 1 🎲🎲🎲
        	            	+🟥🟥🟥 STDERR️️ 🟥🟥🟥️
        	            	+Failed to list users for instance "da6946e0-7f3f-4fe4-afb3-5836dfb0d783"
        	            	+🟥🟥🟥 JSON STDERR 🟥🟥🟥
        	            	+{
        	            	+  "error": "failed to list users for instance \"da6946e0-7f3f-4fe4-afb3-5836dfb0d783\""
        	            	+}
        	            	 
        	Test:       	Test_UserGetURL/With_custom_user
    custom_url_test.go:65: 
        	Error Trace:	.../rdb/v1/custom_url_test.go:90
        	            				.../scaleway-cli/core/testing.go:693
        	            				.../scaleway-cli/core/testing.go:531
        	Error:      	Not equal: 
        	            	expected: string("postgresql://custom-user@163.172.166.66:4818")
        	            	actual  : <nil>(<nil>)
        	Test:       	Test_UserGetURL/With_custom_user
--- FAIL: Test_UserGetURL/With_custom_user (0.02s)

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