Fix tag: selection for projects with semantic models

[jtcohen6]

resolves #8749

Problem

In projects with semantic models, tag: selection started failing with the release of v1.6.4

Solution

Add more defensive code around tag: selection. Previously, this method assumed that all graph-selectable resources have a tags attribute, but semantic models do not (yet).

Rather than backporting an addition of tags to semantic models, we would rather backport more defensive code.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (416bc84) 86.62% compared to head (d72cdce) 84.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8750      +/-   ##
==========================================
- Coverage   86.62%   84.11%   -2.51%     
==========================================
  Files         176      176              
  Lines       25772    25772              
==========================================
- Hits        22325    21679     -646     
- Misses       3447     4093     +646     

Flag	Coverage Δ
integration	80.16% <100.00%> (-3.23%)	⬇️
unit	65.13% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
core/dbt/graph/selector_methods.py	90.13% <100.00%> (-0.90%)	⬇️

... and 55 files with indirect coverage changes

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[QMalcolm]

This looks great 🚀 I double checked that without the fix in selector_methods.py the added test failed, and it did. Then it stopped failing once the fix in selector_methods.py was present. WOOOOOOOO