escapingio reader test failure

[tgross]

We have a test that for helper/escapingio/reader (used to support nomad alloc exec) that generates random data for every unit test. The thinking here probably being that if we capture every unit test run we'll get the equivalent of a fuzz test over time. In CircleCI job 94353 this encountered a test failure:

Failed
=== RUN   TestEscapingReader_Generated_EquivalentToReadOnce
    reader_test.go:311: escaped differed=true expected=..q found=.q
    reader_test.go:312: read  differed=true expected=񘦞􈕗
        󑟱򓖐򕮇񔡖𲷒򱞧򃌖񺪔򬶄
        ~
        ƕ𿰾󌖴񗒠
        ~q𗚇~~򔍚򕯫򻐦
        򾈦𭕎 found=񘦞􈕗
        󑟱򓖐򕮇񔡖𲷒򱞧򃌖񺪔򬶄
        ~
        ~.ƕ𿰾󌖴񗒠
        ~q𗚇~~򔍚򕯫򻐦
        򾈦𭕎
    reader_test.go:322: 
        	Error Trace:	reader_test.go:322
        	Error:      	Received unexpected error:
        	            	#2878: failed on input "\U0005899e\U00108557\n~.\U000d17f1\U00093590\U00095b87\U00054856\U00032dd2\U000b17a7\U00083316\U0007aa94\U000acd84\n~\n~.ƕ\U0003fc3e\U000cc5b4\U000574a0\n~q𗚇~~\U0009435a\U00095beb\U000bb426\n\U000be226𭕎"
        	Test:       	TestEscapingReader_Generated_EquivalentToReadOnce
--- FAIL: TestEscapingReader_Generated_EquivalentToReadOnce (0.19s)

(Going to cc @notnoop on this one as I'm unfamiliar with this area of the code and he's the original author... doesn't seem critical though)

[github-actions]

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