Add E-Branchformer model checkpoint in OWSM v2

[pyf98]

This PR adds the model link to E-Branchformer in OWSM v2.
Despite being trained for fewer updates, E-Branchformer shows clear improvement over Transformer at such a large scale.
We will train and release E-Branchformer based models at even larger scales.

[codecov]

Codecov Report

Merging #5517 (3c8476f) into master (0d77ccf) will increase coverage by 6.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5517      +/-   ##
==========================================
+ Coverage   69.40%   75.40%   +6.00%     
==========================================
  Files         708      709       +1     
  Lines       65274    65361      +87     
==========================================
+ Hits        45304    49288    +3984     
+ Misses      19970    16073    -3897     

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	65.67% <ø> (-0.03%)	⬇️
test_integration_espnet2	48.68% <ø> (ø)
test_python_espnet1	19.14% <ø> (?)
test_python_espnet2	51.47% <ø> (ø)
test_utils	23.10% <ø> (ø)

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[sw005320]

Thanks!