Add shouldSkipUninstall to avoid GPU driver teardown on restart

[karthikvetrivel]

This PR is a part of this endeavor:

GPU Driver container should avoid re-installing drivers on spurious container restarts

Relevant PRs:

• Check if NVIDIA kernel modules are loaded to avoid modprobe gpu-operator#1746
• Add fast-track to skip uninstall/install if NVIDIA driver modules present gpu-driver-container#454

Decision Tree:

shouldSkipUninstall()
│
├─> [1] config.forceReinstall == true?
│   ├─> YES → ❌ PROCEED WITH UNINSTALL
│   │           return (false, "")
│   │           Log: "Force reinstall is enabled, proceeding with driver uninstall"
│   │
│   └─> NO → Continue to [2]
│
├─> [2] isDriverLoaded()?
│   │   Check: /sys/module/nvidia/refcnt exists
│   │
│   ├─> NO → ❌ PROCEED WITH INSTALLATION
│   │          return (false, "")
│   │          Log: "Driver not currently loaded, proceeding with installation"
│   │
│   └─> YES → Continue to [3]
│
└─> [3] hasDriverConfigChanged()?
    │   Read: /run/nvidia/driver-config.state
    │   Build current config from env vars + config files
    │   Compare: currentConfig == storedConfig?
    │
    ├─> YES (config changed) → ❌ PROCEED WITH UNINSTALL
    │                           return (false, reason)
    │                           Log: "Driver configuration has changed: <reason>"
    │                           
    │   Reasons:
    │   • "no previous driver configuration found" (file missing)
    │   • "unable to read previous driver configuration" (read error)
    │   • "driver configuration changed" (content differs)
    │
    └─> NO (config matches) → ✅ SKIP UNINSTALL
                               return (true, "desired version and configuration already present")
                               Log: "Installed driver version and configuration match desired state, skipping uninstall"


LEGEND:
═══════
❌ PROCEED = return (false, reason) → uninstallDriver() continues
✅ SKIP = return (true, reason) → uninstallDriver() returns nil early


SCENARIOS:
═════════

Scenario 1: Clean Restart (no modules loaded)
  [1] forceReinstall=false → Continue
  [2] isDriverLoaded()=false → ❌ PROCEED

Scenario 2: Non-Clean Restart (modules loaded, config unchanged)
  [1] forceReinstall=false → Continue
  [2] isDriverLoaded()=true → Continue
  [3] hasDriverConfigChanged()=false → ✅ SKIP

Scenario 3: Config Changed (version, params, kernel, etc.)
  [1] forceReinstall=false → Continue
  [2] isDriverLoaded()=true → Continue
  [3] hasDriverConfigChanged()=true → ❌ PROCEED

[karthikvetrivel]

@cdesiniotis I've moved shouldSkipUninstall so that the operands still release /run/nvidia/driver mounts.

[shivamerla]

use this from the OPERATOR_NAMESPACE env instead of hard coding.

[karthikvetrivel]

This definition was in the original version, not sure why it is in the diff. If OPERATOR_NAMESPACE is set, that value is used. Otherwise, it uses the Value field as a default, which is what we use this variable for.