Use gene reference files to generate E gene trees

[j23414]

Description of proposed changes

Following up on the Generating gene reference files PR, use the E gene reference files to create E gene trees.

Visual summary (view whole pipeline plan so far)

Related issue(s)

• Issue: Add E gene builds #17
• Earlier PR: Add E gene trees #18
• Related PR in Measles: Make tree for 450bp of the N gene ("N450) in Measles PR#20 which included changes suggested by some 2024-03-12 Nextstrain Gene Tree slides.

Checklist

• [x] Checks pass
• [x] Genome and E gene builds are created by the phylogenetic workflow (github action "phylogenetic")

Links to resulting trees below

	genome	E gene
all	all/genome	all/E
denv1	denv1/genome	denv1/E
denv2	denv2/genome	denv2/E
denv3	denv3/genome	denv3/E
denv4	denv4/genome	denv4/E

A manual run of the dengue serotype 4 E gene tree might look like:

# from dengue repo top level
nextstrain build phylogenetic auspice/dengue_denv4_E.json