Add proper validation for phone numbers

[johannaengland]

Closes #2662.

[github-actions]

Test results

     12 files       12 suites   13m 17s ⏱️
3 220 tests 3 220 ✔️ 0 💤 0 ❌
9 135 runs  9 135 ✔️ 0 💤 0 ❌

Results for commit 7022311.

♻️ This comment has been updated with latest results.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #2694 (7022311) into master (e879e67) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2694   +/-   ##
=======================================
  Coverage   55.19%   55.19%           
=======================================
  Files         561      561           
  Lines       40917    40917           
=======================================
  Hits        22584    22584           
  Misses      18333    18333           

Files	Coverage Δ
...thon/nav/alertengine/dispatchers/sms_dispatcher.py	44.11% <100.00%> (ø)

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[lunkwill42]

Looks much better for the NAV specifics :)

A reminder though, that we do have access to many real-world values through our customer installations. We could extract those just for a quick test against real data (not disclosing anything to the world, though)

[johannaengland]

I have just tested this against all real-world values I have access to and all works.