operator,storage-operator: pin Go toolchain to 1.24.13 to fix CI lint failures

[ezekiel-alexrod]

Add explicit 'toolchain go1.24.13' directive to both operator and
storage-operator go.mod files to prevent Go's automatic toolchain
selection from choosing incompatible versions.

Problem:
After Go 1.26.0 release (Feb 10, 2026), Go's toolchain selection
algorithm started automatically choosing Go 1.25.7 instead of 1.24.13.
Go 1.25.7 is incompatible with golang.org/x/tools v0.20.0, causing
all CI lint jobs to fail with:
invalid array length -delta * delta (constant -256 of type int64)

This affects ALL branches based on development/131.0.

Root cause:
Go's algorithm prefers 'latest patch before most recent version'.
Before Feb 10: [1.24.13, 1.25.7] → chooses 1.24.13 (before 1.25)
After Feb 10: [1.24.13, 1.25.7, 1.26.0] → chooses 1.25.7 (before 1.26)

Solution:
Pin toolchain to go1.24.13 (latest Go 1.24 patch) to ensure:

• Reproducible builds
• Consistent CI behavior
• Compatibility with current dependencies

The directive is placed immediately after 'go' line as per Go
best practices: https://go.dev/doc/toolchain

Files modified:

• operator/go.mod: Added toolchain directive
• storage-operator/go.mod: Added toolchain directive

This is a minimal fix to unblock CI. A proper Go 1.26 bump will be
done in a separate ticket with full dependency updates.

References:

• Go toolchain selection: https://go.dev/doc/toolchain
• Algorithm source: https://go.dev/src/cmd/go/internal/toolchain/switch.go
• Bug in x/tools v0.20.0: tokeninternal.go:64

Fixes: MK8S-131

[bert-e]

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[ezekiel-alexrod]

Closing the PR since it's preferred to use the latest patch of 1.22, thus 1.22.12 to this date.