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

https://github.com/netobserv/netobserv-ebpf-agent/pull/250

Checklist

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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).

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3520d9d) 66.09% compared to head (ff1659e) 66.09%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #568 +/- ## ======================================= Coverage 66.09% 66.09% ======================================= Files 102 102 Lines 7409 7409 ======================================= Hits 4897 4897 Misses 2221 2221 Partials 291 291 ``` | [Flag](https://app.codecov.io/gh/netobserv/flowlogs-pipeline/pull/568/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/flowlogs-pipeline/pull/568/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | `66.09% <ø> (ø)` | | 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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[msherif1234]

not needed really