use unknown for interface we can't detect instead of ""

[msherif1234]

Description

need to be consistent when can't find interface name and always use unknown string

Dependencies

n/a

Checklist

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• [ ] Will this change affect NetObserv / Network Observability operator? If not, you can ignore the rest of this checklist.
• [ ] Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
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• QE requirements (check 1 from the list):
  • [ ] Standard QE validation, with pre-merge tests unless stated otherwise.
  • [ ] Regression tests only (e.g. refactoring with no user-facing change).
  • [ ] No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[codecov[bot]]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (6f1d70a) 33.86% compared to head (110b8ae) 34.06%. Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/exporter/proto.go	0.00%	16 Missing and 2 partials :warning:
pkg/flow/deduper.go	85.00%	2 Missing and 1 partial :warning:
pkg/utils/utils.go	50.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #250 +/- ## ========================================== + Coverage 33.86% 34.06% +0.20% ========================================== Files 39 39 Lines 3479 3508 +29 ========================================== + Hits 1178 1195 +17 - Misses 2233 2243 +10 - Partials 68 70 +2 ``` | [Flag](https://app.codecov.io/gh/netobserv/netobserv-ebpf-agent/pull/250/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/netobserv/netobserv-ebpf-agent/pull/250/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | `34.06% <54.71%> (+0.20%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv#carryforward-flags-in-the-pull-request-comment) to find out more.

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[jotak]

/lgtm

[msherif1234]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msherif1234

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