Make all python scripts python3 compatible

[albertteoh]

Which problem is this PR solving?

• Resolves [Feature]: update python to python3 #4673

Description of the changes

• Adds python 3 shebang to each python script.
• The same can be done in a follow up PR to jaeger-ui if this PR is accepted.

How was this change tested?

• Checked all python scripts within the jaeger project begin with a python3 shebang:

$ find . -name "*.py" | grep -v site-packages | grep -v venv | grep -v jaeger-ui | xargs head -1

```
==> ./scripts/utils/ids-to-base64.py <==
#!/usr/bin/env python3

==> ./scripts/draft-release.py <==
#!/usr/bin/env python3

==> ./scripts/release-notes.py <==
#!/usr/bin/env python3

==> ./scripts/import-order-cleanup.py <==
#!/usr/bin/env python3

==> ./scripts/updateLicense.py <==
#!/usr/bin/env python3

==> ./docker-compose/monitor/otlp_exporter_example.py <==
#!/usr/bin/env python3
```

• Checked all python scripts within the jaeger project are executable:

$  find . -name "*.py" | grep -v site-packages | grep -v venv | grep -v jaeger-ui | xargs ls -al
-rwxr-xr-x  1 albertteoh  staff   949 Apr 24 00:35 ./docker-compose/monitor/otlp_exporter_example.py
-rwxr-xr-x  1 albertteoh  staff  1561 Aug 27 06:41 ./scripts/draft-release.py
-rwxr-xr-x  1 albertteoh  staff  2874 Aug 26 20:44 ./scripts/import-order-cleanup.py
-rwxr-xr-x  1 albertteoh  staff  5095 Aug 27 06:32 ./scripts/release-notes.py
-rwxr-xr-x  1 albertteoh  staff  2787 Aug 26 20:44 ./scripts/updateLicense.py
-rwxr-xr-x  1 albertteoh  staff   848 Aug 27 06:37 ./scripts/utils/ids-to-base64.py

• Checked make fmt runs successfully.
• Checked make changelog runs successfully.
• Checked make draft-release runs successfully.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
  - [ ] I have added unit tests for the new functionality
  - [ ] I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (db3d1bb) 97.03% compared to head (699d92a) 97.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4700      +/-   ##
==========================================
- Coverage   97.03%   97.02%   -0.02%     
==========================================
  Files         301      301              
  Lines       17880    17880              
==========================================
- Hits        17350    17348       -2     
- Misses        425      426       +1     
- Partials      105      106       +1     

Flag	Coverage Δ
unittests	97.02% <ø> (-0.02%)	⬇️

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see 3 files with indirect coverage changes

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[albertteoh]

These are implicitly imported in python3.

[albertteoh]

Python3 is a bit more strict with print statements.

[albertteoh]

I feel the named formatted strings are a bit more readable, supported in python3.