Add Fortigate port and switch table

[UTXOnly]

What does this PR do?

• Adds support for FORTINET-FORTIGATE-MIB fgSwDeviceTable and fgSwPortTable
  • enables monitoring of managed switch ports and switch resource usage tagged by switch_name and switch_serial

Motivation

• Zendesk support case #2013960

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.29%. Comparing base (3668a89) to head (f2dc8f0).
⚠️ Report is 1030 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
aerospike	?
cassandra	?
celery	?
cilium	?
confluent_platform	?
couchbase	?
dotnetclr	?
elastic	?
exchange_server	?
gitlab	?
hive	?
hivemq	?
ignite	?
iis	?
jboss_wildfly	?
kafka	?
kafka_consumer	?
kuma	?
marklogic	?
mongo	?
mysql	?
openstack_controller	?
pdh_check	?
postgres	?
presto	?
sap_hana	?
snmp	95.72% <100.00%> (+<0.01%)	⬆️
solr	?
sqlserver	?
tomcat	?
vertica	?
voltdb	?
weblogic	?
windows_performance_counters	?
windows_service	?

Flags with carried forward coverage won't be shown. Click here to find out more.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[NouhaManai96]

looks good once tests are updated and are passing

Review from urseberry is dismissed. Related teams and files:

• documentation
  • snmp/tests/compose/data/fortinet-fortigate.snmprec