Refactor: load config with configloader

[MartinForReal]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Refactor:load config with configloader
Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[andyzhangx]

/retest

[MartinForReal]

/retest

[MartinForReal]

/retest

[andyzhangx]

/retest

[MartinForReal]

/retest

[andyzhangx]

/lgtm
/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, MartinForReal

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[MartinForReal]

/retest

[andyzhangx]

/retest

[MartinForReal]

/test pull-azurefile-csi-driver-external-e2e-nfs --

[MartinForReal]

/retest

[MartinForReal]

/test pull-azurefile-csi-driver-external-e2e-nfs --

[MartinForReal]

/retest

[andyzhangx]

/retest

[andyzhangx]

/retest

[andyzhangx]

/retest

[andyzhangx]

external e2e test failed as expected since cifs driver is not installed on 6.2.0-1016-azure, error msg:

Output: mount error: cifs filesystem not supported by the system
mount error(19): No such device
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)

[k8s-ci-robot]

@MartinForReal: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-azurefile-csi-driver-e2e-migration	92efc76	link	true	/test pull-azurefile-csi-driver-e2e-migration
pull-azurefile-csi-driver-external-e2e-nfs	92efc76	link	true	/test pull-azurefile-csi-driver-external-e2e-nfs
pull-azurefile-csi-driver-external-e2e-smb	92efc76	link	true	/test pull-azurefile-csi-driver-external-e2e-smb
pull-azurefile-csi-driver-e2e-capz	92efc76	link	true	/test pull-azurefile-csi-driver-e2e-capz

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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