feat: Adding panel description to dashboards

[Hardikl]

There are 3 category of expressions in dashboards.

• 1. Simple metrics in one panel --> Added description direct from metric docs
• 2. Arithmetic expression in one panel --> Pending for now, Need to add appropriate description
• 3. Multiple metrics in one panel --> Pending for now, Need to decide next steps

[Hardikl]

There are few counters put in ignore list, As we don't get description for them, we need to manually formed as per our need.

"Volume Access ($Activity) History", 
"Volume Access ($Activity) History By Percent", 
"Volume Modify ($Activity) History", 
"Volume Modify ($Activity) History By Percent", 
"Destination Relationships per Node", 
"Source Relationships per SVM", 
"Destination Relationships per SVM", 
"Service Latency by Resources", 
"NFSv3 Latency Heatmap", 
"NFSv3 Read Latency Heatmap", 
"NFSv3 Write Latency Heatmap", 
"NFSv4 Latency Heatmap", 
"NFSv4 Read Latency Heatmap", 
"NFSv4 Write Latency Heatmap", 
"NFSv4.1 Latency Heatmap", 
"NFSv4.1 Read Latency Heatmap", 
"NFSv4.1 Write Latency Heatmap",
"Top $TopResources Volumes by Inode Files Used Percentage", 
"Top $TopResources Volumes by Number of Compress Attempts", 
"Top $TopResources Volumes by Number of Compress Fail",

With current description changes, category 1 mentioned above is completed.