[NDM] [Cisco ACI] Use actual int for interface index

[zoedt]

What does this PR do?

QA issue: payload could not be processed because an int was not passed for the interface index

During QA, devices were appearing on the integration check, but not on the NDM page itself - it was successfully creating metadata to send but the service seemed to not be processing it correctly.

Verified in logging from network-devices-writer:
Getting errors such as:

{
caller | decoder/decoder.go:124
error | error decoding event: error unmarshalling event: cbor: cannot unmarshal UTF-8 text string into Go struct field decoder.structEvent.custom of type int32
level | WARN
ts | 2024-08-23T21:47:49.046857+00:00
}

Motivation

Additional Notes

QA

1. ddev env start cisco_aci py3.11 --base on this branch
2. ddev env config edit cisco_aci py3.11
3. add to the config:

instances:
  - aci_url: https://sandboxapicdc.cisco.com # public sandbox
    username: admin
    pwd: "!v3G@!4@Y" # double quotes are necessary here
    tls_verify: false
    send_ndm_metadata: true
    namespace: your-namespace

4. ddev env reload cisco_aci py3.11
5. ddev env agent cisco_aci py3.11 check > output.txt

Check the NDM devices page - check for the devices and the interfaces to appear

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• 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

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.68%. Comparing base (2b3dc01) to head (4856c38).
Report is 22 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
cisco_aci	94.92% <81.81%> (-0.03%)	⬇️
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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