Fix invalid K8s label value error

[jogrogan]

Fixes the following error we ran into:

a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?'

Issue is that the label appender was truncating labels blindly over 64 characters with no regards to the new ending character.

[github-actions]

Code Coverage

Overall Project	84.51%	🟢
Files changed	100%	🟢

File	Coverage
DependencyLabels.java	95.51%	🟢

[ryannedolan]

For follow up -- probably should move this to K8sUtils:

Hoptimator/hoptimator-k8s/src/main/java/com/linkedin/hoptimator/k8s/K8sUtils.java

Line 32 in 4f2728c

public static String canonicalizeName(String name) {