[receiver/mongodb] TLS Settings Ignored in certain circumstances

[schmikei]

Describe the bug
Did some digging and noticed the alpha receiver/mongodbreceiver was checking for a non-nil error from configtls.LoadTLSConfig() before inputting into the mongo-go-driver

Steps to reproduce
Set up a mongodb 4.4 instance with these settings:

net:
   tls:
      mode: requireTLS
      certificateKeyFile: /opt/mongo/tls/mongo-test.localnet.pem
      allowConnectionsWithoutCertificates: true

And the mongod logs indicate a problem from the client:

{"t":{"$date":"2022-07-01T22:21:27.345+00:00"},"s":"I",  "c":"NETWORK",  "id":22988,   "ctx":"conn8528","msg":"Error receiving request from client. Ending connection from remote","attr":{"error":{"code":141,"codeName":"SSLHandshakeFailed","errmsg":"The server is configured to only allow SSL connections"},"remote":"127.0.0.1:58444","connectionId":8528}}

What did you expect to see?
Before:

        tlsConfig, err := c.LoadTLSConfig()
	if err != nil && tlsConfig != nil {
		clientOptions.SetTLSConfig(tlsConfig)
	}

After:

        tlsConfig, err := c.LoadTLSConfig()
	if err == nil && tlsConfig != nil {
		clientOptions.SetTLSConfig(tlsConfig)
	}

What did you see instead?
Metrics collection did work through TLS

What version did you use?
Version 0.54.0 version of the mongodbreceiver

What config did you use?

receivers:
  mongodb:
    hosts:
      - endpoint: keith-mongo-test.bluemedora.localnet:27017
    username: admin
    password: password
    collection_interval: 20s
    tls:
      insecure: false
      cert_file: /opt/mongo/tls/mongo-test.localnet.crt
      key_file: /opt/mongo/tls/mongo-test.localnet.key
      insecure_skip_verify: true
exporters:
  logging:

service:
  pipelines:
    metrics:
      receivers:
      - mongodb
      exporters:
      - logging

Environment
OS: "RHEL 7.9"

Additional context

Will author a PR shortly to resolve this!