Add new project features to API

What does this MR do and why?

This MR adds environments_access_level, feature_flags_access_level, infrastructure_access_level, monitor_access_level to the Projects API.

Related to #364240 (comment 1202560305)

Screenshots or screen recordings

Test project:

Features enabled:

API responses:

GET /projects:

[
	{
		"id": 6,
		"description": "Consequatur odit rem aperiam sed corrupti cum.",
		"name": "Flight",
		...
		"releases_access_level": "enabled",
		"environments_access_level": "enabled",
		"feature_flags_access_level": "enabled",
		"infrastructure_access_level": "enabled",
		"monitor_access_level": "enabled",
		...
	}
]

GET /projects/6

{
	"id": 6,
	"description": "Consequatur odit rem aperiam sed corrupti cum.",
	"name": "Flight",
	...
	"releases_access_level": "enabled",
	"environments_access_level": "enabled",
	"feature_flags_access_level": "enabled",
	"infrastructure_access_level": "enabled",
	"monitor_access_level": "enabled",
        ...
}

POST /projects

Request body:

{
	"name": "test-projects-api",
	"path": "test-projects-api",
	"releases_access_level": "private",
	"environments_access_level": "private",
	"feature_flags_access_level": "private",
	"infrastructure_access_level": "private",
	"monitor_access_level": "private"
}

Response:

{
	"id": 23,
	"description": null,
	"name": "test-projects-api",
	...
	"releases_access_level": "private",
	"environments_access_level": "private",
	"feature_flags_access_level": "private",
	"infrastructure_access_level": "private",
	"monitor_access_level": "private",
	...
}

PUT /projects/6

Request body:

{
	"releases_access_level": "disabled",
	"environments_access_level": "disabled",
	"feature_flags_access_level": "disabled",
	"infrastructure_access_level": "disabled",
	"monitor_access_level": "disabled"
}

Response:

{
	"id": 6,
	"description": "Consequatur odit rem aperiam sed corrupti cum.",
	"name": "Flight",
	...
	"releases_access_level": "disabled",
	"environments_access_level": "disabled",
	"feature_flags_access_level": "disabled",
	"infrastructure_access_level": "disabled",
	"monitor_access_level": "disabled",
	...
}

MR acceptance checklist

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