PWX-33069: Upgrading golang to 1.20.7

[zoxpx]

• also updating linter-tools

What this PR does / why we need it:

We're changing golang-compiler version 1.19.1 -> 1.20.7

Note, there was a drastic reduction of vendor/ -files

• this is due to removal of github.com/golangci/golangci-lint@v1.50.1 code-dependency
• the golangci-lint@v1.50.1 is buggy (hangs + memory-leak w/ go-1.20), and also
• we switched to using a golangci-lint binary - so we don't need to "keep the sources of the tool"

Which issue(s) this PR fixes (optional)
Closes # PWX-33069

Special notes for your reviewer:

[zoxpx]

Note -- Travis failed due to unrelated:

[2023-08-17T16:16:09.569Z]         	            	+     Annotations: (map[string]string) (len=2) {
[2023-08-17T16:16:09.569Z]         	            	+      (string) (len=11) "description": (string) (len=103) "Failed to set up Portworx license on {{$labels.instance}}. Please check licenses and/or license server.",
[2023-08-17T16:16:09.569Z]         	            	+      (string) (len=7) "summary": (string) (len=58) "Failed to set up Portworx license on {{$labels.instance}}."
[2023-08-17T16:16:09.569Z]         	            	+     }
[2023-08-17T16:16:09.569Z]         	            	+    }
[2023-08-17T16:16:09.569Z]         	            	+   },
[2023-08-17T16:16:09.569Z]         	            	+   PartialResponseStrategy: (string) ""
[2023-08-17T16:16:09.569Z]         	            	   }
[2023-08-17T16:16:09.569Z]         	Test:       	TestMonitoringMetricsEnabled
[2023-08-17T16:16:09.569Z] --- FAIL: TestMonitoringMetricsEnabled (0.01s)

• the pxdocs got updated w/ the new prometheous-rules, and the build did not pick it up..

[zoxpx]

Ping -- any chance of getting a review on this PR ?

Note, the PR "looks scary" (1800 vendor/ -files removed) -- but this is because we had golangci-lint sources checked in (used w/ make lint). Since there is no need to keep the linter-tool sources checked in, I removed them, and caused 1800-files diff.

[nikita-bhatia]

LGTM, please run operater regression job to make sure nothing is breaking before merging the PR :)

[zoxpx]

Looks like most Operator tests are taking edge-install.portworx.com as an "input parameter", so

• I've tested this PR manually, and
• will retest once the code is committed in master-branch, and before cherry-picking to px-rel-23.7.0

[zoxpx]

Security scan report @ https://aetos.pwx.purestorage.com/security/Operator/master/2023-08-24-00-45-59-261286

• 0 criticals, 12 highs

Jenkins test @ https://jenkins.pwx.dev.purestorage.com/job/Operator/view/Operator%20Release%20Dashboard/job/op-basic-hotfix/32/

• PASSED

[zoxpx]

Proceeding to cherry-pick to px-rel-23.7.0