Fix auth encoding backport

[mariomac]

Backport of #446
Fixes #442

[grcevski]

LGTM! Thanks for fixing this!

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bcdb9a3) 78.17% compared to head (1023f48) 65.86%.
Report is 8 commits behind head on main.

Files	Patch %	Lines
pkg/internal/export/otel/grafana.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #447       +/-   ##
===========================================
- Coverage   78.17%   65.86%   -12.31%     
===========================================
  Files          61       58        -3     
  Lines        5039     4933      -106     
===========================================
- Hits         3939     3249      -690     
- Misses        888     1420      +532     
- Partials      212      264       +52     

Flag	Coverage Δ
integration-test	65.86% <0.00%> (+0.26%)	⬆️
unittests	?

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