chore: fix cache paths for backcompat tests

[dyladan]

Fixes #2510

[codecov]

Codecov Report

Merging #2511 (665a842) into main (25e5dde) will decrease coverage by 1.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2511      +/-   ##
==========================================
- Coverage   94.47%   93.21%   -1.27%     
==========================================
  Files          73      133      +60     
  Lines        2279     5008    +2729     
  Branches      504     1064     +560     
==========================================
+ Hits         2153     4668    +2515     
- Misses        126      340     +214     

Impacted Files	Coverage Δ
...s/opentelemetry-core/src/platform/node/sdk-info.ts	0.00% <0.00%> (-100.00%)	⬇️
...pentelemetry-core/src/platform/node/performance.ts	0.00% <0.00%> (-100.00%)	⬇️
...pentelemetry-core/src/platform/node/environment.ts
...opentelemetry-core/src/platform/node/timer-util.ts
...emetry-core/src/platform/node/RandomIdGenerator.ts
...ntelemetry-core/src/platform/node/hex-to-base64.ts
...entelemetry-sdk-metrics-base/src/ObserverResult.ts	100.00% <0.00%> (ø)
...emetry-api-metrics/src/platform/node/globalThis.ts	100.00% <0.00%> (ø)
...elemetry-sdk-metrics-base/src/export/Controller.ts	76.00% <0.00%> (ø)
...try-sdk-metrics-base/src/export/aggregators/Sum.ts	100.00% <0.00%> (ø)
... and 60 more

[dyladan]

/easycla

[dyladan]

This is blocking release please review @open-telemetry/javascript-approvers