chore: Remove reference of deprecated ioutil package and grpc methods

[chimanjain]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

• Remove reference of deprecated ioutil package
• Remove reference of deprecated grpc methods
• update go version to 1.25.10

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[chimanjain]

Can the reviewers please verify thiese changes.

[chimanjain]

@andyzhangx can you please review these changes.

[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: andyzhangx, chimanjain
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[chimanjain]

@pohly can you please review this!

[chimanjain]

Can the reviewers please verify these changes

[xing-yang]

Can you rebase?

[Copilot]

Pull request overview

This PR modernizes the codebase by removing usage of deprecated Go ioutil helpers and deprecated gRPC dialing APIs, updating call sites to use current gRPC credential and client-creation patterns.

Changes:

• Replaced deprecated gRPC APIs (WithDialer, Dial, WithInsecure) with WithContextDialer, NewClient, and WithTransportCredentials(insecure.NewCredentials()).
• Replaced ioutil.ReadFile with os.ReadFile in sanity helpers.
• Updated connection establishment flow to explicitly Connect() and wait for connectivity.Ready.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
utils/grpcutil.go	Migrates connection setup to grpc.NewClient/WithContextDialer, adds explicit Connect() + readiness wait loop.
test/driver_test.go	Updates test client credentials away from grpc.WithInsecure().
pkg/sanity/sanity.go	Replaces ioutil.ReadFile with os.ReadFile and updates default dial options to insecure transport credentials.
driver/mock.go	Updates mock driver client connection to use insecure transport credentials.

Comments suppressed due to low confidence (1)

test/driver_test.go:113

• If Connect fails, the test currently calls t.Errorf but then continues and will defer conn.Close() on a potentially nil connection, causing a panic and masking the real failure. Fail fast (t.Fatalf/return) when the connection cannot be established.

	conn, err := utils.Connect(s.Address(), grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		t.Errorf("Error: %s", err.Error())
	}
	defer conn.Close()

---

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[xing-yang]

/lgtm
/approve

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, chimanjain, xing-yang

The full list of commands accepted by this bot can be found here.

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