add check_only template for publishing platform integrations

[james-eichelbaum]

Adds a new check_only option for ddev create - this option enables the creation of agent checks when the manifest already exists and prefills the appropriate information from the manifest. It also includes a --skip-manifest flag which will prompt disable checking for the manifest and using its fields, but still avoid creating the non-agent check files that are typically required. The intention of this is to be used with publishing platform, where the non-code portions of the integration have already been created in github or otherwise.

Test plan

Happy path: ddev create -t check_only my_integration

ddev create -t check_only test_integration     
Make sure to use the display name. e.g. MapR, Ambari, IBM MQ, vSphere, ...
Do you want to continue? [y/N]: y
Created in `~/dd/marketplace`:
acme_inc_test_integration
├── datadog_checks
│   └── acme_inc_test_integration
│       └── config_models
│           ├── __init__.py
│           ├── defaults.py
│           ├── instance.py
│           ├── shared.py
│           └── validators.py
│       └── data
│           └── conf.yaml.example
│       ├── __about__.py
│       ├── __init__.py
│       └── check.py
│   └── __init__.py
├── tests
│   ├── __init__.py
│   ├── conftest.py
│   └── test_unit.py
├── hatch.toml
└── pyproject.toml

No manifest: ddev create -t check_only my_integration --skip-manifest

ddev create -t check_only test_integration --skip-manifest
Make sure to use the display name. e.g. MapR, Ambari, IBM MQ, vSphere, ...
Do you want to continue? [y/N]: y
Email used for support requests: test
Your Company Name: test
The product or company homepage: test
Email used for subscription notifications: test
Created in `~/dd/marketplace`:
test_test_integration
├── datadog_checks
│   └── test_test_integration
│       └── config_models
│           ├── __init__.py
│           ├── defaults.py
│           ├── instance.py
│           ├── shared.py
│           └── validators.py
│       └── data
│           └── conf.yaml.example
│       ├── __about__.py
│       ├── __init__.py
│       └── check.py
│   └── __init__.py
├── tests
│   ├── __init__.py
│   ├── conftest.py
│   └── test_unit.py
├── hatch.toml
└── pyproject.toml

Regression test: ddev create -t check my_integration

ddev create -t check test_integration2                    
Make sure to use the display name. e.g. MapR, Ambari, IBM MQ, vSphere, ...
Do you want to continue? [y/N]: y
Email used for support requests: test
Your Company Name: test
The product or company homepage: test
Email used for subscription notifications: test
Created in `~/dd/marketplace`:
test_test_integration2
├── assets
│   └── configuration
│       └── spec.yaml
│   └── dashboards
│       └── test_test_integration2_overview.json
│   └── service_checks.json
├── datadog_checks
│   └── test_test_integration2
│       └── config_models
│           ├── __init__.py
│           ├── defaults.py
│           ├── instance.py
│           ├── shared.py
│           └── validators.py
│       └── data
│           └── conf.yaml.example
│       ├── __about__.py
│       ├── __init__.py
│       └── check.py
│   └── __init__.py
├── images
│   └── IMAGES_README.md
├── tests
│   ├── __init__.py
│   ├── conftest.py
│   └── test_unit.py
├── CHANGELOG.md
├── README.md
├── hatch.toml
├── manifest.json
├── metadata.csv
└── pyproject.toml

ECOS-1617

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 89.55%. Comparing base (2a83f38) to head (41e9701).
Report is 4 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
datadog_checks_dev	77.46% <12.50%> (-0.19%)	⬇️
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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[iliakur]

on a cursory glance looks good!

[alai97]

Looks good for docs