remove deprecated oss token rotating uts

[AlbeeSo]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[huww98]

If I understand this correctly, the reader may race with the old dir cleanup process, trying to read the already deleted files. I think it is OK, ossfs should retry when facing this. Let's remove this case to avoid flake.

/lgtm
/kind flake

Example flake: https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_alibaba-cloud-csi-driver/1604/pull-alibaba-cloud-csi-driver-verify-unit/2010622176385830912

=== RUN   TestRotateTokenFiles_SymlinkAtomicUpdate/verify_consistency_during_concurrent_reads
    ossfs_secret_test.go:1282: 
        	Error Trace:	/home/prow/go/src/github.com/kubernetes-sigs/alibaba-cloud-csi-driver/pkg/mounter/interceptors/ossfs_secret_test.go:1282
        	Error:      	Not equal: 
        	            	expected: "aksecret1"
        	            	actual  : ""
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-aksecret1
        	            	+
        	Test:       	TestRotateTokenFiles_SymlinkAtomicUpdate/verify_consistency_during_concurrent_reads
        	Messages:   	AccessKeySecret should match old version
    ossfs_secret_test.go:1284: 
        	Error Trace:	/home/prow/go/src/github.com/kubernetes-sigs/alibaba-cloud-csi-driver/pkg/mounter/interceptors/ossfs_secret_test.go:1284
        	Error:      	Not equal: 
        	            	expected: "exp1"
        	            	actual  : ""
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-exp1
        	            	+
        	Test:       	TestRotateTokenFiles_SymlinkAtomicUpdate/verify_consistency_during_concurrent_reads
        	Messages:   	Expiration should match old version