fix: convertMemToBytes helper

[darkweaver87]

This PR fixes convertMemToBytes helper.

This function aims to handle SI, IEC prefixes or no prefixes (cf. https://github.com/kubeflow/crd-validation/blob/master/vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go#L44).
SI prefixes use power of 10 (e.g. 1e18 = 1 x 10^18) (m | "" | k | M | G | T | P | E).
IEC prefixes use power of 2 (e.g. 0x1p60 = 2^60) (Ki | Mi | Gi | Ti | Pi | Ei).

The values should be the same:

• 128974848 ✅
• 129e6 ✅
• 129M ✅
• 128974848000m ❌
• 123Mi ✅

Test:

$ helm template test ./charts/opentelemetry-collector/ -f charts/opentelemetry-collector/examples/using-GOMEMLIMIT/values.yaml --set resources.limits.memory=128974848000m | grep GOMEMLIMIT -A 1
            - name: GOMEMLIMIT
              value: "98400000000MiB"
$ git checkout fix/helper 
$ helm template test ./charts/opentelemetry-collector/ -f charts/opentelemetry-collector/examples/using-GOMEMLIMIT/values.yaml --set resources.limits.memory=128974848000m | grep GOMEMLIMIT -A 1
            - name: GOMEMLIMIT
              value: "98MiB"

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[TylerHelmuth]

@darkweaver87 please bump the chart's patch version and run make generate-examples CHARTS=opentelemetry-collector