NAS-132372 / 25.04 / Add /dev/zvol root for explorer

[RehanY147]

Changes:

Adds option to load zvols alongside datasets by providing two root paths. /dev/zvol alongside /mnt when calling filesystem.listdir endpoint. ix-explorer root property should be set to / for this. Default root for ix-explorer is /mnt

Testing:

Test on the TrueCloud Task Form. The path explorer should show '/' as it's root. When expanded, it should show two children paths. '/mnt' and '/dev/zvol'. When expanded, '/mnt' should show the normal datasets and '/dev/zvol' should show the zvols.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-132372

[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.39%. Comparing base (1e0dd8e) to head (e9613d4).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/app/services/filesystem.service.ts	76.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11106      +/-   ##
==========================================
- Coverage   82.39%   82.39%   -0.01%     
==========================================
  Files        1648     1647       -1     
  Lines       57926    57917       -9     
  Branches     5947     5950       +3     
==========================================
- Hits        47729    47719      -10     
- Misses      10197    10198       +1     

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[undsoft]

We may also want to address the [ENOENT] Directory /dev/zvol does not exist error that may happen if user does not have any zvols.

[undsoft]

let's not abbreviate

[undsoft]

A bit hacky, but it works.
Can we change it so that the icon used for zvols is not a generic file icon?

[undsoft]

While symlink icon is good, I meant inferring that something is a zvol and using a zvol icon we use on Datasets page.

[bugclerk]

JIRA ticket https://ixsystems.atlassian.net/browse/NAS-132372 is targeted to the following versions which have not received their corresponding PRs: 24.10.2

[bugclerk]

This PR has been merged and conversations have been locked.
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