Add maintenance_interval field to Instance Template and Instance sche…

…duling. (hashicorp#7365)

* Move testing to handwritten

* Move testing to handwritten

* Fix lint

* Fix typo

* Add remove step and update documentation

* Add remove step and update documentation

* Fix comparing string to nil

* Add field to handwritten defs

* rebase on main & resolve conflicts

* Fix doc formatting

* Add maintenance interval to Instance resource

* Add maintenance interval to Instance resource

* Add maintenance interval to Instance resource

* Change function names to valid

* Fix type mismatch

* Fix type mismatch

* Fix function name

Signed-off-by: Modular Magician <magic-modules@google.com>

.changelog/7365.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added `maintenance_interval` field to `instance-template` and `instance` resource (beta)
+```

website/docs/r/compute_instance.html.markdown

@@ -385,7 +385,6 @@ specified, then this instance will have no external IPv6 Internet access. Struct
 * `instance_termination_action` - (Optional) Describe the type of termination action for VM. Can be `STOP` or `DELETE`.  Read more on [here](https://cloud.google.com/compute/docs/instances/create-use-spot) 
 
 * `max_run_duration` -  (Optional) [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html) The duration of the instance. Instance will run and be terminated after then, the termination action could be defined in `instance_termination_action`. Only support `DELETE` `instance_termination_action` at this point. Structure is [documented below](#nested_max_run_duration).
-
 <a name="nested_max_run_duration"></a>The `max_run_duration` block supports:
 
 * `nanos` - (Optional) Span of time that's a fraction of a second at nanosecond
@@ -397,6 +396,7 @@ specified, then this instance will have no external IPv6 Internet access. Struct
    315,576,000,000 inclusive. Note: these bounds are computed from: 60
    sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years.
 
+* `maintenance_interval` - (Optional) [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html) Specifies the frequency of planned maintenance events. The accepted values are: `PERIODIC`.
 <a name="nested_guest_accelerator"></a>The `guest_accelerator` block supports:
 
 * `type` (Required) - The accelerator type resource to expose to this instance. E.g. `nvidia-tesla-k80`.

website/docs/r/compute_instance_template.html.markdown

@@ -565,19 +565,18 @@ specified, then this instance will have no external IPv6 Internet access. Struct
 * `instance_termination_action` - (Optional) Describe the type of termination action for `SPOT` VM. Can be `STOP` or `DELETE`.  Read more on [here](https://cloud.google.com/compute/docs/instances/create-use-spot) 
 
 * `max_run_duration` -  (Optional) [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html) The duration of the instance. Instance will run and be terminated after then, the termination action could be defined in `instance_termination_action`. Only support `DELETE` `instance_termination_action` at this point. Structure is [documented below](#nested_max_run_duration).
-
 <a name="nested_max_run_duration"></a>The `max_run_duration` block supports:
 
 * `nanos` - (Optional) Span of time that's a fraction of a second at nanosecond
-	resolution. Durations less than one second are represented with a 0
-	`seconds` field and a positive `nanos` field. Must be from 0 to
-	 999,999,999 inclusive.
+    resolution. Durations less than one second are represented with a 0
+    `seconds` field and a positive `nanos` field. Must be from 0 to
+     999,999,999 inclusive.
 
 * `seconds` - (Required) Span of time at a resolution of a second. Must be from 0 to
    315,576,000,000 inclusive. Note: these bounds are computed from: 60
    sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years.
 
-    
+* `maintenance_interval` - (Optional) [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html) Specifies the frequency of planned maintenance events. The accepted values are: `PERIODIC`. 
 <a name="nested_guest_accelerator"></a>The `guest_accelerator` block supports:
 
 * `type` (Required) - The accelerator type resource to expose to this instance. E.g. `nvidia-tesla-k80`.