fix: removed unused option PrevTCPSockStats from linux util (#1924)

# Description

I removed unused code from linux_util, specifically PrevTCPSockStats. I
also added some entries to gitignore including test-summary(generated
after make test) and ignoring logs.

## Related Issue

This pr related to #1066 

## Checklist

- [x] I have read the [contributing
documentation](https://retina.sh/docs/Contributing/overview).
- [x] I signed and signed-off the commits (`git commit -S -s ...`). See
[this
documentation](https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification)
on signing commits.
- [x] I have correctly attributed the author(s) of the code.
- [x] I have tested the changes locally.
- [x] I have followed the project's style guidelines.
- [x] I have updated the documentation, if necessary.
- [x] I have added tests, if applicable.

## Screenshots (if applicable) or Testing Completed
I've provided two screenshots, one from make test, another is just
linting.
testing
<img width="1276" height="743" alt="image"
src="https://github.com/user-attachments/assets/4a32cf70-fdd7-4bf8-b2c9-15a3f736421e"
/>

Linting
<img width="1280" height="745" alt="image"
src="https://github.com/user-attachments/assets/85cce4db-4824-4eb8-861e-7d1ae24787b7"
/>


## Additional Notes

Add any additional notes or context about the pull request here.

---

Please refer to the [CONTRIBUTING.md](../CONTRIBUTING.md) file for more
information on how to contribute to this project.

Co-authored-by: Alex Castilio <[email protected]>

Author: letv1nnn

.gitignore

@@ -17,6 +17,9 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+# logs
+*.log
+
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
@@ -48,3 +51,5 @@ netperf-*.csv
 .certs/
 
 artifacts/
+
+test-summary

pkg/plugin/linuxutil/linuxutil_linux.go

@@ -82,10 +82,9 @@ func (lu *linuxUtil) run(ctx context.Context) error {
 			return nil
 		case <-ticker.C:
 			opts := &NetstatOpts{
-				CuratedKeys:      true,
-				AddZeroVal:       false,
-				ListenSock:       false,
-				PrevTCPSockStats: lu.prevTCPSockStats,
+				CuratedKeys: true,
+				AddZeroVal:  false,
+				ListenSock:  false,
 			}
 			var wg sync.WaitGroup
 
@@ -94,11 +93,10 @@ func (lu *linuxUtil) run(ctx context.Context) error {
 			wg.Add(1)
 			go func() {
 				defer wg.Done()
-				tcpSocketStats, err := nsReader.readAndUpdate()
+				_, err := nsReader.readAndUpdate()
 				if err != nil {
 					lu.l.Error("Reading netstat failed", zap.Error(err))
 				}
-				lu.prevTCPSockStats = tcpSocketStats
 			}()
 
 			ethtoolOpts := &EthtoolOpts{

pkg/plugin/linuxutil/types_linux.go

@@ -88,9 +88,6 @@ type NetstatOpts struct {
 
 	// get only listening sockets
 	ListenSock bool
-
-	// previous TCP socket stats
-	PrevTCPSockStats *SocketStats
 }
 
 type EthtoolStats struct {