Analyze PGO profiles during EIM

@dmachaj noticed that a good chunk of our boot work is in .text$zz... so it's not in the PGO training.

When I put the initial PGO training tests in at https://github.com/microsoft/terminal/blob/main/src/cascadia/WindowsTerminal_UIATests/SmokeTests.cs, it was like the bare minimum to get us going on the PGO stuff.

EIM is probably a good time to revisit that and check how effective they're actually being and whether we need to make adjustments to the training set.

Start with src/cascadia/WindowsTerminal_UIATests/SmokeTests.cs and review the initial PGO training tests. Analyze the EIM profiles against the boot work in .text$zz... to assess whether the training set is effective. Done means identifying any gaps and making the necessary training-set adjustments.

Written by the indexing model from the issue text.