Add lock for the write operation of azurerm_postgresql_configuration

[neil-yechenwei]

fixes #14531

--- PASS: TestAccPostgreSQLConfiguration_backslashQuote (467.47s)
--- PASS: TestAccPostgreSQLConfiguration_clientMinMessages (528.81s)
--- PASS: TestAccPostgreSQLConfiguration_deadlockTimeout (556.04s)
--- PASS: TestAccPostgreSQLConfiguration_multiplePostgreSQLConfigurations (777.19s)

[tombuildsstuff]

hey @neil-yechenwei

Thanks for this PR - I've taken a look through and left a couple of minor comments inline but if we can fix those up then this should otherwise be good to merge 👍

Thanks!

[neil-yechenwei]

@tombuildsstuff , thanks for your comments. I've updated code. Please take another look. Thanks.

[katbyte]

Thanks @neil-yechenwei - LGTM 🏗️

[github-actions]

This functionality has been released in v2.90.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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