add systemd receiver to builder config (#44425)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This adds systemreceiver to builder config 

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes
#44420

<!--Describe what testing was performed and which tests were added.-->
#### Testing
Start otel collector with following config 
```
receivers:
  systemd:
    scope: system
    units:
      - sshd.service

processors:
  batch: {}

exporters:
  debug:
     verbosity: detailed

extensions:
  health_check:

service:
  pipelines:
    metrics:
      receivers: [systemd]
      processors: [batch]
      exporters: [debug]
```

Author: khushijain21

.chloggen/add-systemdreceiver.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. receiver/filelog)
+component: receiver/systemd
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "This allows systemd receiver to be used in collector config"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [44420]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: 
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

cmd/otelcontribcol/builder-config.yaml

@@ -238,6 +238,7 @@ receivers:
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/statsdreceiver v0.140.1
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/stefreceiver v0.140.1
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/syslogreceiver v0.140.1
+  - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/systemdreceiver v0.140.1
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcpcheckreceiver v0.140.1
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcplogreceiver v0.140.1
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tlscheckreceiver v0.140.1